The Sport Relief marathon continues on BBC2 with David Walliams and Miranda Hart taking over the presenting duties. Sporting royalty Zara Phillips and Sir Steve Redgrave join the cast of Twenty Twelve as the spoof organisers of the 'Olympics' produce yet another fine mess en route to the Games, while Jake Humphrey presents a special Never Mind the Buzzcocks with Louise Redknapp and Mel C alongside the regulars.