BBC Two Grand Tours of Scotland's Lochs (T) Sat 20:30

Grand Tours of Scotland's Lochs (T)

Paul Murton continues 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 hydro-electric schemes.

S01 E03