I found this documentary on the concept art house Opus Artz, based in London. They’ve worked on high profile games like Infamous 2, Bioshock 2, & Dead Space 2. I’ve run across collective like this before, but it’s always good to keep tabs on the UK based ones. It’s a good benchmark of the kinds of people who’ll compete for high level freelance work. The studio is also surprisingly small for the scope of the work they do, with just 3 permanent staff.