WINDOW cleaners Lee Mason (left) and Paul Wright pause for a break in their cleaning gondola outside the 50th floor of the One Canada Square skyscraper, the London home of Bank of New York Mellon and NYSE Euronext, on 8 February 2011.

It takes a month to clean all the windows on what is currently the tallest building in Britain (until the Shard takes over in 2012), with the cleaners suspended up to 190m from the ground.