Adam Peaty, David Walliams and Helen Skelton dive into the fun as they join James for a line-up of riotous challenges. First up is a swimming race.

Footballer Patrice Evra and comedians Rob Beckett and Roisin Conaty join the boys. Look out for a performance James says is the best he's ever seen on the show.

James finds a funny way to stitch up Jamie as the boys welcome long distance legend Mo Farah, netball coach Tracey Neville and comedian Rob Beckett.