Overview: David Walliams exposes TV's biggest cock-ups - as stars battle to keep their programmes on air. Brenda Blethyn is attacked by an amorous puppy, a Downing Street reporter swallows a fly and Stephen Mulhern faces a potty-mouthed member of the public… With mistakes featuring Martin Clunes, Ant & Dec, Will.i.am, Amanda Holden, Paddy McGuiness – plus the stars of Love Island - who will be left standing when the stars come crashing down?