A user on the Facepunch forums has looked into some games available on steam and found something rather odd, some games were not available in the UK store until a few months after the official release date. These games apparently included Brink, Red Faction, Homefront and Darksiders and is currently affecting Saints Row, Warhammer: Space Marine and Skyrim with these games showing up as unavailable in the UK.
This of course caused quite a lot of outcry on the internet, with many out for Gamegroup's blood. Problem is, that this was essentially a forum post that got picked up by a couple of news outlets. The poster in question actually didn't source anything and pretty much came to this conclusion himself. This was confirmed when Eurogamer got a statement from Game that outright denied these accusations, not even dancing around the subject in a vague way that they could get away with it.
"We can categorically state that these rumours do not relate to Game Group or any of its employees,"
"We have had no such conversations with any publisher and have been in contact with various publishers who can confirm this for you as well."
While I'll admit that it is certainly possible that Game are lying, I don't honestly think that is the case. A big company like that would have an easier time doing damage control over the issue and saying something about Steam being a competitor, rather than lying and then it all coming out in the open later on. They even went as far as to say "Ask the publishers too" so they seem pretty confident in their statement.
This looks to me like a case of the internet going wild with a theory that has no real source, only rumours and speculation. The idea that Game were doing this is really bad and possibly illegal but I really think there are other reasons the the UK is getting these steam delays.