S1, E1: Following single-track roads from one side of the stunning Scottish Highlands to the other, Peter and Chris retrace the route of 1930s car enthusiasts into some of the UK’s most extreme driving country. Along the way, they fire up a 1903 “Dog Cart,” venture up the notorious Inverfarigaig Corkscrew in a vintage 3-wheel rally car, and cross over to Skye on the world’s oldest car ferry of its kind.