No 16GB stock in the London stores that I just tried...
Could easily have walked with an 8GB one though - minimal or no queues in the Oxford street branches (and the one queue I did see dissipated as soon as a customer informed them that there were no 16's - which the staff were too busy to do).
Dammit. I'm back in London on Saturday - they better have some 16Gb phones left in Ox Street!
I've heard the Regent Street store has some. How lame would that be if all the O2 stores are out, but the Apple Store around the corner isn't? Thanks for not allowing upgrades in your stores, Apple...