I'll be in London from 30/12 to 3/1, but with several other commitments. Any time in that period would be possible but 2/1 would be best. But I've already messed up enough other meets with my scheduling issues, so don't make too much effort to work around me unless those times are also great for everyone else.

I also would like to go to London in February or March sometime, so if you plan it on a weekend in one of those two months I could probably make it with enough (at least two or three weeks') notice.