Cheers guys!
Bit of a lack of planning the night before in the end, meant we just went to Oxford Circus - had a wander up and down Oxford and Regeant Street. Nothing really spectacular (we'd been a few times before) as the lights weren't on yet, though it still looked nice.
Went into a few shops, but everywhere was too busy to enjoy.
Then went up to Canary Wharf and that was better. Lots of lights, nicely decorated shopping centres. Was absolutely rammed at around 2pm, but was much quieter (eerily so!) by 3pm.
Had lunch in Smollensky's bar in Canary Wharf which was a really nice bar.
Then had a bit more of a wander round and came home.
Shame as I say - wish I'd have planned some bits out a bit more and probably gone later as it would have been nice to see Oxford St with the lights on.
Anyways, didnt see any of the protests at all (apparently they rampaged through Oxford street a little while after we left?!) so that was one good thing.
Thanks for all the tips on places to go guys!