Giles,
2011 Anthems are on the Giant Australia website, and will probably be the same spec in the UK. Comes with 3 x 10 drivetrain, which doesn't bother me (I'd rather have 3×9 or 2×10) and some other minor changes. The colour of the X2 is hideous to my eyes though, so I prefer the 2010 model. I've picked mine up for £1600 (the bike shop sponsors the XC series I race in, so all racers get 20% off).
Dales Cycles in Glasgow have only a Demo bike left in medium which they are doing for £1500. I am riding it next week, but they are looking to sell it after that I believe, and I'm told it'll be in great condition.
I also think that Giant have them at £1600 in their own stores, although I'm not near a Giant store, so can't confirm that. At lot of other stores seem to be low on stock.