Vgchartz tracks Canada in Americas, and Canada does on average 1/10th of USA, whether that's near half of the UK or not I do not know. 

I obviously know the problem is vgchartz, not sure how you could have interpreted otherwise. I want to vgchartz to be as accurate as possible and if in fact these results are because of 360 growing into more markets we can't cover, it makes vgchartz less accurate. If it's undertracked in areas we cover, we can learn and improve from this information.

Undertracked or overtracked, neither are good.  It simply proves the point, that regardless of the situation, VGChartz numbers must be taken with a grain of salt.  They are useful, but to a limited extent, and they aren't the last word in sales figures. 

VGChartz numbers are estimates, they even say so in their methodology:

"Data is directly estimated in the following countries on a weekly basis..."

So, again, the numbers they present aren't factual data.  They are estimated guesses based on data they've collected from gamers, retailers, publishers, and wholesalers, as well as trending. 

Don't act surprised if people don't assume VGChartz is the word of God in gaming sales, because it isn't.  In terms of sales, they're no different that any other analyst.  Everything has to be taken with a grain of salt, as well, relying on one sole source for your information is not going to be of any benefit.  VGChartz isn't infalable.
Having said that, who cares at this point whether the Xbox 360 or the PS3 topped sales in 2011?  The gaming industry is losing sales and revenue like there is no tomorrow, Sony is in deep financial trouble, and everyone is planning on coming out with a new console within the next year or two. 

Move on people!  2011 is over.

I cannot wait until E3 so people have something more important to argue about.

yeah I know plus to theprof00 I think that promotion ended a while ago the free xbox 360 giveaways with certain windos 7 purchaes.

I meant to say at least. It could be as much as 1m undertracked if we take into account early april numbers (as pointed out below).

Plus if they are so badly out on the 360 what is to say the ps3 numbers are accurate? Didn't we have it quite high for the last shipments to only find it was lower? Obviously that is the nature of the website, sometimes it will be right, sometimes it will be over and sometimes it will be under. But from a logical point of view you would have to say it is unlikely PS3 sold more then 360 in 2011. There is far more evidence to show 360 sold more. In fact the only evidence we have that ps3 sold more is what ioi says.

But like I said in december and like I said in one of the other recent sales threads. Someone posts a number here and it is taken as gospel. Nobody dares to question it. It simply has to be true because someone said it is. And when a company releases official figures those numbers are now looked at with mistrust and doubt. Which is quite frankly stupid.