Inverness to the Cairngorms

S1, E6: Michael Portillo crosses the Culloden Viaduct aboard the Caledonian Sleeper to arrive bright and early in the coastal city of Inverness, from which he heads north on a scenic adventure to the Orkney archipelago. On boggy moorland overlooking the Moray Firth near Inverness, Michael explores the battlefield at Culloden, where Bonnie Prince Charlie's Jacobite army fought British government troops in 1746.