Episode 4

Chris Harris and the £2m Bugatti Chiron attempt to cross the Arabian peninsula faster than Matt LeBlanc and a roster of money-no-object transport solutions.

Back in Britain, Rory Reid constructs a life-size arcade game to test the Renault Twingo GT and its city car rivals, while rap star Tinie Tempah tackles the Top Gear track in the Reasonably Fast Toyota GT86.