Paul Murton explores the wilds of Loch Etive, from the spectacular tidal race of the Falls of Lora, where kayakers revel in the overfalls and ride a three-metre standing wave, to high-altitude camping on a hill opposite Buchaille Etive More, watching the sunset, and lights up the hundreds of lochans across Rannoch Moor.

Paul begins his Grand Tour with a chilly swim across Loch Ba high on Rannoch Moor, struggles against the elements while trainspotting and meets some veteran Tunnel Tigers - men who tunnelled deep inside the Grampians, diverting water to hydroelectric schemes.