Alain Robert isn't the only one scaling London's buildings. Poor old Santa's having a hard time of it in Battersea. Does he just use one chimney, or should he scale all four? And do the resident Cybermen deserve Christmas presents anyway? We'll be featuring a seasonal Touch-up every day...

So, back to our Christmas theme today, with this mouthwatering picture of St Paul's standing atop Pudgate Hill. The dripping roof no doubt tastes a lot better than its counterpart of 1666. During the Great Fire, the lead roof of Old St Paul's melted, and a plumbate river oozed...

OK, so we're going to take a break from our daily dose of yuletide touch-ups to show you this creation from reader Hugh Macdonald. His idea might be just what the capital needs to power all those Christmas lights. Three cheers for genetic modification. From tomorrow, we'll be featuring...

Before the demolition of Old London Bridge, whose narrow arches restricted the flow, the Thames used to freeze over in the coldest winters. In such years, the denizens of London would gather on the ice for a frost fair. Here's how it might look today. Although we suspect that...

Last week we challenged you to peer into alternative universes and find out what London would have been like had history taken a different course. Roll the Dice sent in this Teutonic take on the Tube. Had the Germans won either of the world wars, the London underground might...