S1, E1: Following single track 'military' roads from one side of the stunning Scottish Highlands to the other Peter and Chris retrace the route of the 1930s petrol head pioneers into some of the UK's most extreme driving country. Along the way, they fire up a 1903 'Dog Cart', take a spin in a vintage 3-wheel Rally Car up the notorious Inverfarigaig Cork Screw and cross over to Skye on the oldest car ferry of its kind in the world.