Matt Lucas dons an apron to bake alongside DJ Annie Mac, Ed Gamble and rapper Example as they tackle signature stained-glass biscuits, a jam-packed technical, and showstopping cakes that showcase what they did before they were famous.

Ruby Wax, Gareth Malone, Laura Whitmore and Yung Filly make signature fruit turnovers and a chocolate fondant technical, and relive their most embarrassing moments in a meringue showstopper.

Emma Willis, Clara Amfo, Blake Harrison and Alex Horne take on decorated biscuits, madeleines and a showstopping choux sculpture which embodies their secret talent.

Mo Farah, Motsi Mabuse, Katherine Kelly and Ben Miller tackle meringue roulades in the signature challenge, make traditional Italian biscuits in the technical, and render their favourite childhood memory in cake form in the showstopper.

Ellie Goulding, Mawaan Rizwan, Sophie Morgan and Tracey-Ann Oberman make marble cake in the Signature and jam roly-poly in the Technical, before making a showstopping biscuit portrait in honour of their own celebrity hero.