If you are specifically looking for freelance work or contract work in the UK I would recommend GameOps. They are extremely friendly and helpful.
Another site you may come across is Game Contractor but I have found them to be pretty useless to be honest.
If you are looking for a full time position then Stig Strand at Amiqus is well worth talking to. You should also try Fran Mulhern at Recruit 3D.
For basic advice about applying and interviews check out our Job Advice page.