London mayor Boris Johnson has unveiled details of the capital's largest ever outdoor arts programme later this year, which will include free cultural events in all 32 boroughs.

Showtime is designed to celebrate the London 2012 Olympic and Paralympic Games, with events and performances scheduled to take place between 21 July and 9 September.

Johnson said: "We have an unprecedented opportunity to showcase and strengthen London's outstanding culture and creativity, which are a hugely important part of our economy."

Details: www.london.gov.uk