Almost half way through the Bake Off and the remaining eight bakers are faced with biscuits and traybakes. First up, a Signature Challenge that requires them to do something apparently simple; produce their favourite traybake. The bakers offer Mary and Paul their twists on everything from bakewells to banoffees and brownies...Next they face the thinnest Technical Challenge ever devised on Bake Off; the French classic tuiles, biscuits formed into fragile rolls and decorated with piped chocolate. And finally, a Showstopper of epic proportions as the bakers make ‘biscuit towers’.