Plot: Tiff Needell and Jason Plato gain access to a variety of tanks, including a submersible Russian machine and a Chieftain, for a head-to-head battle. Jonny Smith follows the route of Dick Turpin in the new VW Golf GTi, Tom Ford and Radio 1 DJ Judge Jules test the Aston Martin DBS Volante and Tim Shaw investigates the damage that potholes do to cars