on a London bus (with back projection of London streets) was also filmed, on Stage 3A/B at Ealing Film Studios, reportedly directed by Camfield. The recording session of the third episode on 14 May also overran due to issues with the film inserts. Hartnell's grandson Paul Carney visited the set during recording of the fourth episode on 21 May. Production overran again as some wet paint on scenery had prevented a full rehearsal. For the recording of the fifth episode on 28 May, Lambert suggested that the 90-second action sequence—the fight between the Doctor and its robotic counterpart—be recorded first to ensure that Hartnell could regain composure for the remainder of production. The fight scene required precise timing for Hartnell to play both parts; two cameras focused on Hartnell (one on either side) and a third focused on his companions. Martin recalled that Hartnell was dedicated and competent during the fight sequence, having had much experience in similar sequences in his earlier career. The fifth episode recording session overran by 27 minutes. The final episode was recorded on 4 June. Reception Broadcast and ratings The serial was broadcast on BBC1 in six weekly parts from 22 May to 26 June 1965. Viewership numbers were considered extremely positive, though the early summer months meant that it failed to gain the high audience figures for serials like The Dalek Invasion of Earth and The Web Planet. It gained generally a million viewers over the preceding serial, The Space Museum, with the first episode receiving ten million viewers, and made its way into the top 20 most-viewed programmes for the night; the fourth and sixth episodes entered the top 10. The serial's Appreciation Index scores were also successful, ranging from 54 to 57, though not as high as The Dalek Invasion of Earth. The original tapes of the second, fourth, and sixth episodes were erased on 17 August 1967, followed by the third and fifth on 31 January 1969, and the first on 17 July 1969. In 1978, 16mm telerecordings created for overseas markets were discovered at BBC Enterprises. In 1985, the serial was sold through Lionheart as part of a syndicated package to North America, where it was also available as a television movie. In November 1986, the serial was considered for a repeat broadcast as part of TV 50, a celebration of 50 years of the BBC, though it was never