The biscuits are coming. Why? All will be revealed at tonight's Londonist quiz.
(Actually, there's no mystery. We have a round where famous landmarks are obscured by biscuits. Today's Touch Up London is just a lame filler and an excuse to get in another last minute plug for the event. But you really should come. Even if you don't like biscuits very much. We have plenty of rounds that are not based on sweetmeats.)
Background image taken from rjw1's Flickr photostream.