newsletter september 2013 issue no. 7 - institute of · pdf fileprinting and graphics science...

NEWSLETTER

Issue no. 7

September 2013

http://pgs.iop.org

http://pgs.iop.org/

Printing and Graphics Science Group Newsletter September 2013

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Contents

Welcome ................................................................................................................ 4

Message from the Chair ....................................................................................... 5

Committee Membership 2012-2013 ..................................................................... 6

Recent Group Events ........................................................................................... 7

Science of Inkjet and Printed Drops .................................................................. 7

IOP Printing and Graphics Science Group Student Conference ....................... 9

International Standards for Printed Electronics .............................................. 13

The formation of IEC TC119 ............................................................................ 13

Forthcoming Group Events ............................................................................... 15

Advances in Photovoltaics ............................................................................... 15

Science of Inkjet and Printed Drops ................................................................ 15

High-Speed Imaging for Dynamic Testing of Materials and Structures ........... 16

UK Plastic Electronics Research Conference ................................................. 16

IS&T Archiving 2014 Conference .................................................................... 17

Other Events of Potential Interest ..................................................................... 18

9th Conferenza del Colore ................................................................................ 18

29th International Conference on Digital Printing Technologies and Digital

Fabrication (NIP29) .......................................................................................... 18

3D Bioprinting .................................................................................................. 18

AIMCAL Web Coating Conference 2013 ......................................................... 18

21st Color and Imaging Conference ................................................................. 18

Printable Electronics for Industry 2013 ............................................................ 18

WCPC Annual Technical Conference.............................................................. 19

Printed Electronics USA 2013 ......................................................................... 19

Electronic Imaging 2014 .................................................................................. 19

Printed Electronics Europe 2014 ..................................................................... 19


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Awards ................................................................................................................. 20

PGS Group Awards ......................................................................................... 20

Research Student Conference Fund ............................................................... 21

Other Information ................................................................................................ 22

PGS Group on LinkedIn and Facebook ........................................................... 22


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Welcome

Welcome to the 2013 edition of the Printing and Graphics Science Group Newsletter. This issue contains reports on meetings organised by the Group over the past year as well as other events of interest. A summary of forthcoming meetings is also included.

We have two regular Group events coming up in the near future. The 6th 'Science of Inkjet and Printed Drops' meeting will take place on the 6th November and there is still time to submit poster presentations for this event. Our annual student conference will be organised this year in collaboration with the Electronics, Sensors and Photonics KTN as a two day conference dedicated to students: the UK Plastic Electronics Research Conference. This will take place on the 10th-11th December at Loughborough University. Submissions for oral presentations are welcome, please see page 16 for details.

Meetings in emerging areas such as Bioprinting and Printed Electronics are planned for the future; details will be uploaded to our website http://pgs.iop.org as they become available. Our Group pages on LinkedIn and Facebook are also regularly updated with news items and details of upcoming events.

We are always keen to receive items for the Newsletter that may be of interest to our readers. If you have conference reports, details of upcoming events or other material, we would love to hear from you.

Anna Fricker

http://pgs.iop.org/


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Message from the Chair

Hi folks,

Welcome to the Group Newsletter. It has been a busy year for many of us so let me first of all thank all the members who have given up valuable time to the Group this year. And a special thank you to all who have contributed to the newsletter this year.

It is my pleasure to again thank Anna Fricker for her work as Hon. Secretary as well as compiling this newsletter, and Roy Gray as Treasurer. Neil Shepherd had to leave us this year as he had completed the maximum number of years service – thanks for your time and commitment. The Group Committee remains open to new members and we particularly welcome more students and early career scientists. The networking is good and we can give you experience and support in organising meetings and events. We conduct most of our committee meetings by telephone conference but will pay travel expenses for the occasional face to face meeting. Talk to one of the present committee if you are interested.

The Group continues to focus on emerging areas of Printing Science and Technology, but retains an interest in established areas. When recently asked by the IOP for a short statement of our direction we came up with the following.

"To promote the application of physics in current and emerging printing and display technologies. We bridge the established graphics arts industry with the

emerging printed electronics, bioprinting and 3D printing sectors."

We have reluctantly deferred holding another “Preservation and Conservation Issues in Digital Printing” meeting due to lack of support. However, we may get involved in a meeting on Photobook printing in 2014. Our “Science of Inkjet and Printed Drops” meeting goes from strength to strength and our annual Student Conference continues to develop. For the future, the emerging topic of Printed Electronics seems set to continue to provide subject matter for the Group into the future.

Since the last Newsletter we have taken part in a number of events in these areas and you can find reports on all of these in this edition. We are always open to new ideas; again let one of the committee know your thoughts. Check out more on the Group and its events on http://pgs.iop.org.

Hope we can meet up this year.

Cheers,

Alan Alan Hodgson

Chair, Printing and Graphics Science Group August 2013

http://pgs.iop.org/


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Committee Membership 2012-2013

Chair Secretary

Dr Alan Hodgson 3M Security Printing & Systems Ltd. Email: [email protected]

Ms Anna Fricker Email: [email protected]

Treasurer

Mr Roy Gray Email: [email protected]

Ordinary Members

Dr Davide Deganello University of Swansea

Mr Martin Gouch Fujifilm Electronic Imaging Ltd.

Prof. Ian Hutchings University of Cambridge

Mr Trevor Lambourne University of Leeds

Dr Leszek Majewski University of Manchester

mailto:[email protected]

mailto:[email protected]


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Recent Group Events

Science of Inkjet and Printed Drops

8 November 2012 IOP, London, UK

The programme included six invited talks and a poster session. The oral contributors were:

Prof. Jens Eggers, University of Bristol Physics of drop formation

Dr Alfonso Castrejón-Pita, University of Cambridge Experimental studies of the breakup of liquid threads

Dr Jon Morgan, Domino Printing Sciences Continuous inkjet drop generation

Dr Steve Hoath, University of Cambridge Drop-on-demand ink-jetting of linear polymer solutions

Prof. Julia Yeomans, University of Oxford Modelling drops on microstructured surfaces

Liisa Hakola, VTT, Finland Industrial-scale inkjet printing of functional inks for diagnostics and electronics

This one-day meeting was the fifth in a series of annual events which started with meetings on ‘Dynamics of printed drops’ in 2008 and 2009, and since 2010 has been extended to cover all aspects of the formation and deposition of liquid jets and drops, mainly but not exclusively in the context of inkjet printing. It was well-attended by almost equal numbers of participants from academia and industry. The posters covered a wide range of topics, including the coffee ring effect, a new method for drop and jet generation, modelling of drop-on-demand jetting of polymer solutions, jet breakup in drop-on-demand printing, applications of inkjet printing to transistor fabrication and touch-sensitive nanocomposites, and a simple model for the breakup of liquid filaments.

The first speaker, Jens Eggers, started by reviewing historical work by Savart, Lenard and Khamontoff in the nineteenth century, and then discussed the processes by which a liquid drop detaches from a jet, highlighting the role of self-similarity, which can however break down for the case of polymer solutions just before break-off. These processes provide several examples of scaling behaviour.


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Alfonso Castrejon-Pita then presented recent experimental work which explored how the behaviour of a free liquid thread depends on its size and the liquid properties: short fat jets will condense into single drops, whereas longer, thinner threads will break up into two or more drops. He also showed how the geometry of a low-viscosity liquid jet changes as it necks down; just before break-up, the conical angles made by the jet surface converge precisely to the values predicted theoretically in 1998. Precise control of jet break-up is essential for the commercial application of continuous inkjet printing, in which a continuous jet of ink is modulated by an imposed vibration or pressure variation to generate a stable stream of uniform drops. Jon Morgan presented a comprehensive overview of the challenges involved in this technology. Not least of these is the poorly-understood phenomenon of ‘reversal’, in which the length of the jet from the nozzle to the break-up point (the ‘break-up length’) decreases steadily with increasing amplitude of the modulation up to a certain level, and then starts to increase again.

In the second half of the programme, attention turned to drop-on-demand printing, drops on surfaces, and applications. Polymers are often present in inks, and Steve Hoath discussed the key question of how they affect their printability from a drop-on-demand print-head. Drawing on recent experimental and theoretical work, he showed that the limiting concentration of polymer which can be printed depends, for a simple monodisperse linear polymer, in a predictable way on its molecular weight. Three different regimes of behaviour can be identified, in which the ink behaves as a Newtonian fluid (with the polymer chains either coiled or fully stretched), or exhibits viscoelasticity. Liquid drops on solid surfaces feature in many applications, from inkjet printing to raindrops on leaves, paint droplets on car bodies, and microfluidic channels. Small scale features on the surface can modify or control the drop’s behaviour, as on natural or artificial superhydrophobic surfaces, and Julia Yeomans showed how the movement of liquid drops on micropatterned surfaces (for example, with arrays of tiny posts) can be both understood and modelled. The final talk, by Liisa Hakola, reviewed how inkjet printing can be used to manufacture functional devices, in some cases with features which cannot be achieved by other printing processes. These include electrically conductive tracks, disposable point-of-care diagnostic devices for medical applications, light-emitting electrochemical cells, and ‘smart packaging’ incorporating printed food quality indicators (e.g. oxygen or humidity sensors). The challenges of scale-up and manufacturability are considerably greater than for conventional graphical printing.

Prof. Ian Hutchings


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IOP Printing and Graphics Science Group Student Conference

8 December 2012 IOP, London, UK

The meeting this year was most ably organised and chaired by Dr Davide Deganello from Swansea University. The papers this year were of a uniformly high standard.

The event gives an early snapshot of the work being undertaken in key UK groups working in the field of printing and graphics science. As with the event last year it shows the breadth of work being undertaken, particularly in the area of printed electronics.

Development of a Printed Biosensor for HDL-Cholesterol

Termeh Ahmadraji, University of the West of England

This group are using screen printing to print the backbone of the sensor element with inkjet printing to dispense the sensing element. The sensing reaction for HDL-cholesterol can be detected either by colorimetry or by electrochemical detection of hydrogen peroxide. They are using the latter method in their work.


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They are screen printing a Ag/AgCl reference electrode next to a Ag electrode with a carbon overlayer. The biosensor is placed on top of this by inkjet. The sensor is run at room temperature and can detect 0-3mmolar hydrogen peroxide.

A Nanocomposite Printable Ink with Non-Linear Touch Sensitive Electrical Conductivity

Alex Webb, Durham University

Alex is working with Peratech on pressure sensitive composites. There is a move to make these printable. An example of early work on this is the use of Carbon Nanotubes but this project is looking at TiO2 nano needles mixed with TiO2 nanoparticles. The nanoparticles serve to keep the needles apart and the mixture contains natural voids that promote elasticity. The compression results in a change in resistance which is then used for touch sensitivity. The mixture is deposited between 2 electrodes using screen printing. When compressed using finger pressure the resistance drops from a few thousand Ω to around 100Ω.

This presentation gained Alex the Printing Technology Student Conference prize.

Excimer Laser Processing of Spin Coated Transparent Conducting SnO2:Sb Films for Electroluminescent Displays

Neranga Abeywickrama, Nottingham Trent University

This group are looking at processing techniques for transparent conductive oxides (TCOs). They spin coat around 10 layers to get a layer thickness around 850nm. Current sintering processes require around 700°C – too high for many substrates. This group sinter them with an excimer laser after 1 hour at 150°C for the same result, giving access to a wider range of substrates.

Printing Smart Fabrics, Feasible?

Adam Rees, Swansea University

Adam presented the results of an MSc project. He screen printed and tested conductive tracks using silver ink with and without a conventional primer layer onto Lycra, cotton and mixtures of the 2. The screen print line widths were 0.2 – 2mm. Washing in a conventional washing cycle was very effective at removing the ink however. Ink adhesion to the primer was also found to be an issue.

This work uses screen mesh sizes of 61-64, 32-100 NS 27-120. The coarse meshes were found to work better – thicker ink layers? Adam noted that carbon / graphite inks are more printable but show a higher resistance.


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Artist Applications for Colour Construction in Multi-Channel Inkjet Printing

Melissa Olen, Centre for Fine Print Research, University of the West of England

This work is in the early stages of investigating printing of successive layers wet on dry using a Canon graphics printer. It will be interesting to see how this work progresses. It will be good to see this presented again in the future, particularly with some photomicrographs of the results.

Fighting Visual Artefacts with Microcells in Flexography

Anja Hamblyn, Swansea University

Microcells are small holes superimposed on the flexo printing plate. The received wisdom is that these increase uniformity and ink loads. However, this work showed that this does not appear to be the case and it seems more likely that air entrainment is redistributed, reducing the area that is missing ink.

Anja showed some interesting micrographs that appeared to show the missing areas had a periodic nature.

This presentation gained Anja the Colour and Imaging Science Student Conference prize.

Development of Biosensors using Zinc Oxide Nanowires by Printing Technology

Dominic Fung, Swansea University

This work described the use of ZnO nanowires for blood glucose monitoring. One of the stated advantages of ZnO is biocompatibility and low toxicity. This group have chosen to use flexo printing to deposit the nanowire precursors, a strong technology at Swansea. They believe that the use of flexo printing gives a more even distribution of nanowires. After the flexo printing step the print is annealed in an oven to produce the nanowires. Using this technique they can produce 87µ line widths. The prototype glucose sensor was shown to be linear up to 10mmol concentrations.

This nanowire technology is also applicable to other sensor areas, as was displayed at the recent Swansea Bioprinting meeting. As an example this presentation showed a ZnO layer placed over a 200µ track and 200µ gap interdigitated comb, the combination making a gas sensor.

Carbon Black Containing Electrically Conductive Screen Printing Inks

Ali Mohammed, University of Leeds

This work looks at low cost carbon inks on textiles. The inks contain carbon blacks, non-ionic dispersants and common ink binders dispersed in an ink vehicle.


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The resultant print was tested in an ISO 106 wash test. The work achieved 200-500Ω/sq sheet resistivity for draw down coatings.

Flow-Induced Polymer Degradation during Ink-Jet Printing

Joseph Wheeler, OMIC Centre, University of Manchester

Joseph is looking at the degradation of polymers used in ink jet inks, and their degradation in the jetting process. The work showed that 2 passes through a piezo drop on demand head is sufficient to completely degrade these polymers.

The situation looks to be more complex in a continuous inkjet system as degradation may take place in the ink management system too.

Inkjet and Roll-to-Roll Printing of Graphene Electronics

Richard Howe, University of Cambridge

Sonification was the chosen route to produce the graphene for this work, which showed some interesting studies being done by this group on mixed systems.

Dr Alan Hodgson


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International Standards for Printed Electronics

The formation of IEC TC119

This is an introductory article describing a new initiative for standardisation in the field of printed electronics. Here I aim to give you some background on International Standards in general plus a snapshot of the short history of IEC TC119.

Introduction to International Standards

International Standards are produced through 2 main organisations. These are the International Standards Organisation (ISO) and the International Electrotechnical Commission (IEC). The IEC is responsible for all systems pertaining to electrical or electronic items so Printed Electronics falls under their remit.

Although the IEC has overall responsibility for the production of these Standards the actual work to develop these is done in Technical Committees (TC). New Technical Committees are voted in place by a group called the IEC Standardization Management Board (SMB).

Many National Governments recognise the potential benefits of International Standards for trade and development so support the process. Similarly, manufacturing and service companies, both large and small see the benefit of being involved in the process. IEC TC119 (Printed Electronics) is in the early stages of the work to develop standards in this area. Now is a good time to consider involvement in the process.

History of IEC TC119 – Printed Electronics

IEC TC119 is nearly 2 years old. Here is a snapshot of the process as this will explain some of the structure.

In April 2011 the organisation responsible for National Standards in South Korea made a proposal to the IEC to form this Technical Committee. In June 2011 the IEC SMB circulated a proposal for a Printed Electronics TC around the nations that participate in standards. They were asked to vote on this proposal and to indicate interest in participation. In addition the Korean National Standards body volunteered to take on the Secretariat role, one of the 2 key positions in the organisation of a TC.

The vote was positive and in September 2011 IEC TC119 was formally established. Ten nations had chosen to participate at that point (CN, DE, GB, IT, FI, JP, KR, RU, SE, US) and 8 more to observe the process.


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In October 2011 the IEC issued the scope statement submitted by the Secretariat “Standardization of terminology, materials, processes, equipment, products, and health/safety/environment which are related to the printing methods for electronics” and the process to appoint the Chair began. Candidates were nominated by National Bodies and the successful candidate was ratified by full IEC SMB in April.

Participation in the writing of Printed Electronics standards brings various benefits. In addition to advance knowledge of the content of the documents participation also provides substantial unique networking opportunities. There are large formal events where the entire Technical Committee assembles and the first of these took place in Seoul in May.

In addition to these there are smaller informal meetings that take place at trade shows and conferences.

The second plenary meeting took place in San Diego in February 2013 and work is now under way to develop technical standards. I look forward to working with you as this process proceeds and I aim to report on this in future issues.

Dr Alan Hodgson Chair of IEC TC119


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Forthcoming Group Events

Advances in Photovoltaics

24 September 2013 IOP, London, UK

Organised by the IOP Ion and Plasma Surface Interactions Group and co-sponsored by the PGS Group

https://www.eventsforce.net/iop/frontend/reg/thome.csp?pageID=155470&ef_sel_menu=2947&eventID=362&eventID=362

This one day meeting provides a forum to help assess the current state of the art in solar cells. It brings together a list of distinguished invited speakers whose expertise covers the range of photovoltaic technologies.

The conference programme is available at the link above.

Science of Inkjet and Printed Drops

6 November 2013 IOP, London, UK

https://www.iopconferences.org/iop/frontend/reg/thome.csp?pageID=187581&eventID=426&eventID=426

This meeting will cover all aspects of the generation, deposition and behaviour of liquid drops, with applications in graphical printing as well as printed electronics, novel materials processing and additive manufacturing (3D printing).

Poster presentations

Contributions for poster presentations are invited: abstracts of a maximum of 250 words should be submitted online by 23th October 2013. References are permitted, as is a maximum of 1 figure. For further details please see the link above.

Registration

The registration deadline is 30th October 2013, with reduced rates for those who register before 9th October 2013. There are also concessionary rates for students.






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High-Speed Imaging for Dynamic Testing of Materials and Structures

18-20 November 2013 IOP, London, UK

Organised jointly by the IOP Applied Physics and Technology Division and DYMAT Association

http://aptd.iopconfs.org/home

Currently, a major revolution is occurring with the availability of inexpensive and good quality digital cameras that allow the imaging of materials and structures at high speeds. However, there are still significant challenges in aspects such a sensor uniformity and reliability; the conference will explore emerging research in this area including high speed infra-red imaging to obtain temperature evolutions alongside the deformation data. The potential for scientific and industrial progress in this field is huge and it is envisioned that testing procedures at high strain rates will be revisited in-depth based on imaging. The non-contact and full-field aspect of the data collection are of upmost importance for flexible materials such as polymers and composites.

The objective of this meeting is to gather some of the world leading figures in this field to exchange scientific information and foster international collaboration on this very timely and exciting topic. The meeting will take place over three days in single session format to allow maximum interaction between speakers and audience. The conference will also include interactive poster sessions, an exhibition of high speed camera manufacturers and a round table session on current challenges and future developments in high speed imaging.

UK Plastic Electronics Research Conference

10-11 December 2013 Loughborough University, UK

Organised jointly by the PGS Group and ESP KTN

https://connect.innovateuk.org/web/espktn/events

The IOP Printing and Graphics Science Group's annual student conference will be organised this year in collaboration with the Electronics, Sensors and Photonics KTN as a two day conference dedicated to students: the UK Plastic Electronics Research Conference.

Presentations are sought at postgraduate level on any subject related to printed, plastic, organic and large area electronics. Potential topics could comprise, but are not restricted to, recent developments in applications, materials and processing. Examples include OLEDs, OPVs, smart packaging, printed biosensors, developments in printing technologies and research into the underpinning physics of printing.

http://aptd.iopconfs.org/home

https://connect.innovateuk.org/web/espktn/events


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The conference will be an opportunity for students to present their work and meet others from around the country who are working in similar fields. As a gathering of leading industry and academic contributors, it will offer potential for professional development and possible collaborations.

Registration, including lunch, is free and funds are available to cover basic travel expenses for speakers. Please keep an eye on the PGS and ESP KTN websites for future updates.

IS&T Archiving 2014 Conference

13-16 May 2014 Berlin, Germany

Organised by the Imaging Science Group of the Royal Photographic Society and co-sponsored by the PGS Group

http://www.imaging.org/ist/conferences/archiving/

The IS&T Archiving Conference is an annual event aimed at the imaging science and the cultural heritage communities. Since the first meeting, Archiving has continued to offer a unique opportunity for imaging scientists and those working in the cultural heritage community (curators, archivists, librarians, etc.), as well as in government, industry, and academia, to come together to discuss the most pressing issues related to the digital preservation and stewardship of hardcopy, audio, and video.

Further information regarding the 2014 conference is available at the link above.

http://www.imaging.org/ist/conferences/archiving/


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Other Events of Potential Interest

9th Conferenza del Colore

19-20 September 2013 Florence, Italy

Joint meeting with the Colour Group (Great Britain)

http://www.gruppodelcolore.it

29th International Conference on Digital Printing Technologies and Digital Fabrication (NIP29)

29 September - 3 October 2013 Seattle, Washington

http://www.imaging.org/ist/Conferences/nip/index.cfm

3D Bioprinting

2 October 2013 Cambridge, UK

https://www.univercellmarket.com/UCM+Events/

AIMCAL Web Coating Conference 2013

27-30 October 2013 Charleston, South Carolina

http://www.aimcal.org/events/web-coating-and-handling-conference/2013/conference/overview.aspx

21st Color and Imaging Conference

4-8 November 2013 Albuquerque, New Mexico

http://www.imaging.org/ist/Conferences/cic/index.cfm

Printable Electronics for Industry 2013

12-13 November 2013 NEC, Birmingham, UK

http://ukprintableelectronics.com/

http://www.gruppodelcolore.it/

http://www.imaging.org/ist/conferences/nip/

https://www.univercellmarket.com/UCM+Events/



http://www.imaging.org/ist/conferences/cic/

http://ukprintableelectronics.com/


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WCPC Annual Technical Conference

18-19 November 2013 Swansea University, UK

http://wcpcswansea.com/events/annual_conference/

Printed Electronics USA 2013

20-21 November 2013 Santa Clara, USA

http://www.idtechex.com/printed-electronics-usa/pe.asp

Electronic Imaging 2014

2-6 February 2014 San Francisco, CA

http://www.imaging.org/ist/Conferences/ei/index.cfm

Printed Electronics Europe 2014

1-2 April 2014 Berlin, Germany

http://www.idtechex.com/printed-electronics-europe/pe.asp

http://wcpcswansea.com/events/annual_conference/

http://www.idtechex.com/printed-electronics-usa/pe.asp

http://www.imaging.org/ist/Conferences/ei/index.cfm

http://www.idtechex.com/printed-electronics-europe/pe.asp


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Awards

PGS Group Awards

The PGS Group makes two awards each year.

Student Presentation Prizes

These prizes are open to all research students currently undertaking work at a university in the UK or Ireland, leading to a PhD or Masters degree, who present their work at the annual Printing and Graphic Science Group Student Conference. The Group will award a prize of £50 for the best Student Presentation in each of two broad areas: Colour and Imaging Science, and Printing Technology.

All presentations given at the Group's Student Conference will be considered for this year's prizes. For more information on this year's conference please see our group calendar.

The 2012 Student Presentation Prizes were awarded as follows.

Colour and Imaging Science

Anja Hamblyn, Swansea University 'Fighting Visual Artefacts with Microcells in Flexography'

Printing Technology

Alexander Webb, Durham University 'A Nanocomposite Printable Ink with Non-Linear Touch Sensitive Electrical Conductivity'

Group Prize

The Printing and Graphics Science Group of the Institute of Physics awards an annual prize of £300 to an individual or organisation that has contributed a significant theoretical or practical application of physics in the area of printing and graphics science.


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Research Student Conference Fund

Further information may be found at the following link.

http://www.iop.org/about/grants/research_student/page_38808.html

http://www.iop.org/about/grants/research_student/page_38808.html


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Other Information

PGS Group on LinkedIn and Facebook

The Group has pages on the LinkedIn and Facebook social networking sites which are regularly updated with news items and details of upcoming events. We look forward to seeing you there.

LinkedIn

http://goo.gl/B0mds

We can be found by searching for the 'Printing and Graphics Science' group on LinkedIn or by following the link above. You will need to be a member of LinkedIn to view the page.

Facebook

http://goo.gl/vX0kC

We can be found by searching for the 'Printing and Graphic Science Group' on Facebook or by following the link above. There is no need to be a Facebook member to view the page.

This newsletter is also available on the web and in larger print sizes The contents of this newsletter do not necessarily represent the views or policies of the Institute of Physics, except where explicitly stated. The Institute of Physics, 76 Portland Place, W1B 1NT, UK. Tel: 020 7470 4800 Fax: 020 7470 4848

http://goo.gl/B0mds

http://goo.gl/vX0kC

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