It's in this comment from chart track:
http://www.chart-track.co.uk/?i=484&s=1111
The UK’s love-affair with Rockstar’s PS2 San Andreas almost 3 years ago is still the benchmark for week 1 and lifetime sales. However, the PS2 installed base back then was around 6.6m (after 4 years) – Microsoft have to make do with ‘just’ 1.4m in less than 2 years. Released on Wednesday 26th September for the first time on Microsoft’s Xbox 360 format, ‘Halo 3’ was bought by 1 in 3 Xbox 360 owners in its first week, whereas 1 in 6 Xbox owners bought ‘Halo 2’ and back in PS2’s heyday (week 44 2004) 1 in 10 PS2 owners bought ‘San Andreas’. Although ‘Halo 3’ had a headstart on San Andreas with 4 days of sales in its first week rather than San Andreas’ 2 days, the launch is still very impressive, helping to more than double the sales of Xbox 360 hardware to the highest level shown this year and even beats Nintendo’s Wii for the first time since week 13 this year.
So, i think this info will help ioi to adjust these new numbers from uk for the week ending 29 september
Note:
For the software charts for this week in uk, you must see this thread:
http://www.vgchartz.com/forum/thread.php?id=7847&start=0#end








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