Ian Stirling and Ben Shires face Sam and Mark in a rollercoaster challenge. Plus a football fan is given the chance to win a stash of prizes and four more parents warble a wet tune in Karasoake.

Boyband New Hope Club surprise two of their biggest fans in the studio and play their latest hit. Blue Peter's Radzi takes on the role of secret agent and goes 'In Yer House'.

When someone forgets to book the studio audience, Sam and Mark are left with time on their hands to reminisce over some of the highlights of the current series. It's been emotional.