The million-selling truck mechanic returns with stories of Columbian kartels, an Arctic mission with the marines, endurance motorbike challenges, plus a few smashes, breaks and sprains along the way.

Guy's been pushing himself to the outer limits, as usual. There's no medals, no big ceremony at the end of it all. He's just driven by putting himself through the misery. And coming out smiling.

The TV job took him to Columbia, where he was waterboarded, shot and shown round a cocaine factory in a jungle clearing. He's also been to the Arctic to join the Royal Marines at their winter training centre, where he plunged into icy waters, marched up mountains and camped out in the freezing wilderness. We can exclusively reveal here that he had a fractured shoulder at the time.

Off the telly, he's gone on two epic bike rides, the first to Istanbul, then Istanbul to Baku, led by his sat nav along multi-lane motorways and up remote goat tracks, sleeping on the roadside. He's been racing (and crashing) on Mablethorpe Beach, he's entered the Scott Trial twice, one of the toughest motorcycle endurance events in the world, and he's been working on the '300mph job' - that's the world record he's going for on two wheels and he's building a bike to get him there. So far he's reached 276 mph, and he's the only person who can tell you what that feels like.

Welcome to the world of Guy Martin.