I had a 2010 frame which was just replaced with a 2011 frame under warranty. In terms of frame, the 2011 has:
– a slightly different tapered top tube (I only noticed it when shouldering the bike),
– a bigger (supposedly stiffer) steerer tube (comes with tapered forks on complete bikes, but I am using 1 1/8 forks with a larger crown race)
– integrated instead of integral/semi-integrated headset (I think!)
– post mount rear brake (saves needing an adaptor, provided you stick with 160mm rotors)
– new Maestro links (curvier and the cables now zip tie to the bottom, so they don’t rub on the links and bushings they way they did on the 2010 frame)
– BB30 bottom bracket (supposedly stiffer, although I’m not convinced of the benefits over HTII)
The forks wouldn’t bother me either way, but the 2011 bikes have 3×10 rather than 3×9, so if you want a 10 speed setup going forward, you already have the right mechs and shifters.
I’m not sure the above adds up to £300 worth of difference, particularly if you prefer the look of the 2010 frame. £300 is a good chunk of cash to spend on upgrades if you want to.