It's an English tradition. Between November and January you can go skating on an artificial track installed inside Somerset House in London. It's a few steps from the St. Paul's Cathedral in the old district of London and is a lovely home. The price is expensive, £ 10.50 by day and £12.50 at night (from 5:30 in the afternoon, as it's already dark). First you have to leave your belongings in a locker, then you get the skates, entry is valid only for 1 hour but it's more than enough. When we went it was the 1st day they opened so there many people, but I imagine that during the season there will be less.