this might upset religious viewers, the scenes were reset in a crypt. This was subsequently revised again, and the crypt was called a cavern, although the set clearly resembled a church crypt. Letts initially intended to write the story himself but found himself short of time due to role as series producer. His wife suggested a friend of hers, Robert Sloman, who was a playwright and journalist. Together they worked on the script in the evening after work. At the time, however, the BBC frowned upon production staff writing for their own series and so Letts and Sloman decided on the pseudonym Guy Leopold - Sloman's son and Letts' middle name respectively. The working title for this story was The Demons, which was commissioned on 17 December 1970. The scripts were completed by mid-February 1971 and worked on by Dicks, who had barely completed work on them by the time the story went into pre-production in March. Director Christopher Barry had worked on Doctor Who before, but wasn't particularly keen to return as he preferred to concentrate on less genre-specific productions. However, he liked the script due to the rural setting and his interest in archaeology. He would go on to direct for the show a number of times again, but still listed The Dæmons as his favourite, saying it was "a damn good script". Much of the serial was filmed on location in Aldbourne, Wiltshire. The location shoot was awarded two weeks' filming, more than double the usual amount at the time, leading to a lot of the finished story being set outside, rather than in studio. Membury airfield in Berkshire and Bridge Farm, Ramsbury, were also used briefly as locations. Filming began on 19 April 1971 and saw pleasant, sunny weather for the first week, leading to sudden overnight snow in the second week – causing filming to be delayed. Some episode one scenes were filmed at night – a rarity for the show, although some of these scenes were filmed during daylight with a dark filter put over the camera lens. Other dark indoor scenes were filmed in a disused aircraft hangar at Bridge Farm, Ramsbury. Filming for the serial caused great excitement in Aldbourne, with a lot of the village residents appearing as extras, as well as the Headington Quarry Morris dancers performing routines in episodes four and five. The cast included David Simeon who himself