Jeremy Clarkson travels to Belfast to conduct a test of the Renaultsport Twingo 133 involving a tunnel, a ferry and the actor Ross Kemp. Meanwhile Richard Hammond investigates ways to speed up summer holidays as he invents the new sport of airport vehicle racing. James May tests the new Vauxhall Insignia VXR in the company of British road signs designer Margaret Calvert, and Jeremy is on and off the track in the BMW X5M, Audi Q7 V12, and the latest supercharged Range Rover.