Jeremy Clarkson tests the new BMW M3 at the track before switching to another BMW, the space-age, hybrid-powered i8, for a revealing trip up the A1 to Whitby. When he gets there and is fuelled by a portion offish and chips, Clarkson must decide which of the two cars he would rather take for the drive home.Also in this programme, Richard Hammond marks the imminent demise of the legendary Land Rover Defender with a heart-stopping attempt to drive one straight up the side of a dam.Meanwhile, James May makes a rare trip to the Top Gear track to test the brand new 500-horsepower Mercedes-AMG GT.The stars in the Reasonably Priced Car are actress Margot Robbie and Hollywood superstar Will Smith.