On paper, this show sounds excellent. Mark is a professional comedian who's appeared on Russell Howard's Good News, BBC Radio 4, BBC Three's Live at the Electric (with sketch group WitTank), and performed stand up across the country. Furthermore, he's an ex-geography teacher and Fellow of the Royal Geographical Society, so you'd expect the show to have the perfect blend of hilarious anecdotes and insightful knowledge. The whole thing should, in theory, amount to an outstanding hour of free entertainment - but the only way to know for sure is to watch it.