Jack Dee takes a long riverside stroll, Andy Zaltzman risks two bites of a vegetable, Emma Sidi does some cartwheels, Babatunde Aléshé gets annoyed with a rocket and Rosie Jones menaces a member of the crew. Chief statistician Alex Horne dons a luminous hat and rings a bell while proceeding at a gentle pace, while Greg Davies awards points, praise and pity.