The widely-publicised launch of Halo: Reach helped double sales of Xbox 360 in the UK last week, according to official chart monitor Gfk-ChartTrack.
Bungie's shooter had a "marked effect on hardware sales", with Xbox "up 99 per cent" for the week ending 18th September, director Dorian Bloch revealed to Eurogamer this afternoon.
Halo: Reach, which launched last Tuesday, 14th September, shifted an estimated 300,000 copies in its first 24 hours at UK retail, and went on to enjoy the fifth biggest-selling launch week ever.
Nevertheless, Halo: Reach's effect on Xbox 360 sales falls well short of the 1000 per cent increase that was fuelled by the launch of the Xbox 360 S model earlier this year.
Eurogamer understands that sales of GAME's limited-edition Halo-themed Xbox 360 played a significant part in the upsurge.