I (Tuomas that is) am planning of coming to London in the end of August, need tips on accomodation, etc. (UPDATE: I'm there again for Christmas 2013.)

ha, reminds me of this: http://www.flickr.com/photos/ianvisits/sets/72157628564018557/detail/

(photos of central london taken on christmas morning)

How's the public transport on Christmas? Our hotel is in SoHo, I guess it'd be nice to find a restaurant within a walking distance for Christmas Eve.

You will have no problems whatsoever on Christmas Eve and there are more restaurants within walking distance of Soho than pretty much anywhere else. Might still be worth booking ahead though.

Public transport will basically shut down completely on Christmas Day and will start up again with slightly reduced services on Boxing Day. There will be football matches played across London on the 26th so things will be running and people will be moving about.

Those pictures of London on Christmas day are amazing. It's like the start of 28 Days Later or something.