Between 1967 and 1978 the BBC routinely deleted archive programmes. 97 of 253 episodes from the programme’s first six years are currently missing. Other affected BBC series include Dad’s Army, Z-Cars, The Wednesday Play, Till Death Us Do Part, Steptoe and Son and Not Only.. But Also. ITV regional franchisees, such as Rediffusion Television and Associated Television, also deleted many programmes.
About Doctor Who missing episodes in brief

With many broadcasters now switching to color transmission, many of the older material was not deemed to be of any further use to the broadcasters. BBC Enterprises also disposed of a large amount of older material including much of the late 1960s and early 1970s Deep Deep Fury, including the final serial Deep Fury in 1968 and the final episode of Deep Fury of the First World War in 1969. The BBC had no central archive at the time; the Film Library kept programmes that had been made on film, while the Engineering Department was responsible for storing videotapes. They had little dedicated storage space, and tended to place piles of film canisters wherever they could find space for them at their Villiers House property. The Engineering Department had no mandate to archive the programme videotapes they held, although typically they would not be wiped or junked until the relevant production department or BBC Enterprises indicated that they had no further use for the tapes. Until the BBC changed its archiving policy in 1978, thousands of hours of programming, in all genres, were deleted. The first Doctor Who master videotapes to be wiped were those for the serial The Highlanders, which were erased on 9 March 1967, a mere two months after Episode 4’s original transmission. Eventually, every single episode of the programme was wiped or wiped from the 1970s master videotape into 1970s into Episode 5. The final episodes for the 1968 serial The Deep Fury were destroyed or wiped in the late 1970s.
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