Greenwich Winter Time Festival
Time Out says
Move over Winter Wonderland, there's a new Christmas experience in town: Greenwich Winter Time Festival, a snowy festive takeover of the world heritage-listed Old Royal Naval College, located right beside the Cutty Sark. The space in front of the riverside building will have a covered ice rink, and a Christmas market filled with contemporary craft and design stalls. Don't worry, it's not all ulta-modern: there will still be food stalls flogging mince pies and mulled wine.
Entry is now free, though it'll cost extra for ice skating or an audience with Santa. Greenwich is pretty Christmassy as is, so Winter Time is a chance to go turbo on the festivities this December.