I have looked into a visual effects company called Framestore. They are based in the UK, and have won numerous Oscar awards for their work.
It formed in 1986 and the company works across several different areas of the media: feature films, commercials, music videos, feature animation and digital. 
In 2004, the company set up an office in New York's SoHo district to serve the US advertising market.Framestore has worked on visual effects from films such as Avatar, The Dark Knight and Harry Potter films.
Framestore is one of the largest visual effects and computer animation studio in Europe.
References-
http://en.wikipedia.org/wiki/Framestore
http://www.prnewswire.co.uk/cgi/news/release?id=186524
http://www.framestore-cfc.com/
