Only in London

Boris Johnson, the mayor of London, has announced a new £2m marketing campaign for the capital

Part of the 'Only in London' campaign is a list of 100 things you can only do in London - examples of what makes Britain's capital an unequalled tourist destination.

He unveiled the campaign this week aboard the London Eye, one of the more obvious attractions that makes the list. 

Of the list of 100 we’ve chosen 25 that we think are the most fun, interesting and unusual. Here are just a few tips on how to enjoy London's unique attractions, from Princess Di’s dresses and the longest champagne bar in the world, to seeing the world’s oldest insect.