A Lamborghini Reventon – one of only 21 ever made and believed to be the only one in the UK – is going up for sale at a London auction soon. The Reventon will be put under the hammer by H&H Classics at the 2012 London Motorexpo, which takes place in Canary Wharf between the 11th and 17th of June. First shown at the 2007 Frankfurt Motor Show, every one of the 20 planned for production had been sold before the car went on sale. (An extra car was made for the Lamborghini museum, labelled 0/20.)