Some of Microsoft's top game development studios, specifically right now, Rare and Playground Games are based in the UK and contribute at least some of the prof

Some of Microsoft's top game development studios, specifically right now, Rare and Playground Games are based in the UK and contribute at least some of the profit and arguably a lot of talent. (Microsoft has a really interesting history of UK game development teams, going way back, including ones they ultimately shut down such as Lionhead.)