Guy Martin attempts to beat the speed record for a human-powered boat, with help from Olympic legends Sir Chris Hoy and Sir Ben Ainslie

Guy tries to cross the English channel on a human-powered airship. His transport takes the form of a bicycle held aloft by a helium balloon the size of a bus, with the pedals driving two propellers. He puts the machine to the test in Bedfordshire's historic Cardington Hangars, where some of the world's biggest flying machines were created, and seeks some military advice on surviving crash landings.

Guy will attempt to break the speed record for a Transit Van. The record currently stands at impressive 174mph. But ever the optimist, Guy wants to reach the 200mph barrier in a souped-up Transit.