Anything interesting going on in late December/early January ??
TimeOut has some pretty good information about Christmas and NYE in London :-) I would for example recommend the New Year's Eve firework display at London Eye.
Info about Christmas in London (shows, events, markets, etc...):
Info about NYE in London (parties, events, etc....):
Hope you have a nice time!
I was in London one December and it was fantastic. There were decorations in all the shopping areas, people filled the streets and it even snowed. In one shop, I swear this is true, people started singing carols along with the songs on the radio.