The battle with Boys Ltd takes a new twist - the 'Boyz' decide to release their new single on the same day as their rivals. In fact, they decide to release the same song - a cover version of D.I.S.C.O. Jason tries his hand at songwriting, and there's a new addition to the Bovz Unlimited camp.

• David Walliams
• Richard Osman
• Matt Lucas

• James Corden
• Frank Harper
• Adam Sinclair