Industry Production Houses in the UK

Aardman Animations - http://www.aardman.com
Bizarre Creations - http://www.bizarrecreations.com
Brandt animation - http://www.brandtanim.co.uk
BskyB - http://www.sky.com/skycom/home
Capcom Europe - http://www.capcom-europe.com
Cell GFX - http://www.cell-gfx.co.uk
Cinesite London - http://www.cinesite.com
Clear - http://www.clear.ltd.uk
Codemaster http://www.codemasters.com
Comforte Infinite Image ltd - [ Awating URL ]
Condor Post - http://www.condor-post.com
Curly Monsters - http://www.curlymonsters.com
Digital Animations - http://www.digital-animations.co.uk/
Double Negative - http://www.dneg.com
Eclipse Creative - http://www.eclipsecreative.co.uk
Framestore|CFC - http://www.framestore-cfc.com
Glassworks - http://www.glassworks.co.uk
Hades Animation Studios - http://www.hades-studios.com
Jellyfish Pictures - http://www.jellyfishpictures.co.uk
Jim Henson's Creature Shop - http://www.creatureshop.com/
Lola Post - http://www.lola-post.com
Light Image Animation - http://www.lightimage.co.uk
MachineFX - http://www.machinefx.co.uk
Me company http://www.mecompany.com
MillTV - http://www.mill.co.uk
mine - http://www.whatismine.com
Nanomation - http://www.nanomation.co.uk
Oasis TV - http://www.oasistv.co.uk
Octagon CSI - ttp://www.octagoncsi.com
Peerless Camera Company - http://www.peerless.co.uk
PyramidTV - http://www.pyramidtv.co.uk
Rage - http://www.rage.com
Realise Studio - http://www.realisestudio.com
Red Post Production - http://www.red-post.co.uk
Rushes - http://www.rushes.co.uk
Skaramoosh - http://www.skara.co.uk
Smoke and Mirrors - http://www.smoke-mirrors.com
Sony Computer Entertainment Europe - http://www.scee.com/index.jhtml
StudioAKA - http://www.studioaka.co.uk
The Moving Picture Company - http://www.moving-picture.co.uk
The Station - http://www.the-station.com/
Unorthododox Styles - http://www.unorthodoxstyles.com
Voodoo Animation - http://www.voodoo-animation.com
VTR - http://www.vtr.co.uk

this list is sourced from vfxtalk.com forums.