Never shopped from them before but looks like it's the UK arm of the US company which started its operations in the UK in August 2011.
Here's the link to the deal:
http://www.gamestop.co.uk/40968_Blu_Ray_Casino_Royale__2006_.aspx
Here's the link to the deal:
http://www.gamestop.co.uk/40968_Blu_Ray_Casino_Royale__2006_.aspx