This episode goes behind the scenes of Night Terrors

Confidential is on location with the Doctor Who crew, presenting behind-the-scenes action from a beautiful 17th century estate in the Gloucestershire countryside and a high-rise housing estate in Bristol.

Matt, Karen and Arthur give us a bit of a sing-song, we spend a long night with the one of the assistant directors and the special effects team show us that, sometimes, good old-fashioned green gloop is the only way.

Mark Gatiss talks to us about writing for three consecutive TV Doctors and, in Script to Screen, find out who plays an all-important historical figure.