Online jigsaw puzzles of London

In 2001 we spent a cold and wet Christmas in London. It was freezing on the red double-decker buses! Normally London bus tours are one of the best ways to sightsee, but open double-decker buses can be chilly in the winter.
By default the puzzle has 99 pieces on a large screen down to 12 on a mobile device. But you can change this on the right side by choosing another number (from 6 to 1200 pieces). Puzzles with a red edge are new!