Photo-London is one of the UK's biggest photography events, presenting the work of 400 contemporary photographers, with stands run by galleries, magazines and publishers, along with talks, book-signings, and related exhibitions around London. It should be an essential visit for anyone interested in contemporary photography. This year it takes place at Old Billingsgate, next to the Tower of London, from 31st May to 3rd June 2007. Entry costs £15.
Photo-London website.