The Day Of The Triffids: Episode 1
The first episode of BBC1’s adaptation of The Day Of The Triffids premieres, based on John Wyndham’s novel. W. Morgan Sheppard (Max Headroom) guest stars. 
The Changes: The Cavern
The tenth and final episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Oscar Quitak (Brazil) guest stars. The series was filmed in 1973, but has been held for broadcast until 1975; an entire generation of young viewers will go on to consider the short series a seminal event in UK genre TV.
The Changes: The Quarry
The ninth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Tom Chadbon (Doctor Who, Blake’s 7) and Oscar Quitak (Brazil) guest star. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Lightning!
The eighth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Tom Chadbon (Doctor Who, Blake’s 7) guest stars. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Heartsease
The seventh episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: A Pile Of Stones
The sixth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Witchcraft!
The fifth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Hostages!
The fourth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Devil’s Children
The third episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Bad Wires
The second episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Noise
The first episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Bernard Horsfall. The series was filmed in 1973, but has been held for broadcast until 1975. Hear about it on the Sci-Fi 5 podcast
Doctor Who: The Tenth Planet, Part 3
The 133rd episode of Doctor Who airs on the BBC. This is the first story to feature the Cybermen, and is the final story of William Hartnell’s tenure as the first Doctor.
Quatermass: State Of Emergency
The BBC airs the sixth episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, bringing the six-part story to a close. The success of the series prompts the BBC to request a sequel series from Kneale. This episode was not archived and does not exist in the BBC’s archives.
Quatermass: An Unidentified Species
The BBC airs the fifth episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, starring Reginald Tate as Prof. Bernard Quatermass. This episode was not archived and does not exist in the BBC’s archives.
Quatermass: Believed To Be Suffering
The BBC airs the fourth episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, starring Reginald Tate as Prof. Bernard Quatermass. This episode was not archived and does not exist in the BBC’s archives.
Quatermass: Very Special Knowledge
The BBC airs the third episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, starring Reginald Tate as Prof. Bernard Quatermass. This episode was not archived and does not exist in the BBC’s archives.
The Quatermess Experiment: Persons Reported Missing
The BBC airs the second episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, starring Reginald Tate as Prof. Bernard Quatermass. Broadcast as a live play with minimal footage from other sources played back during air, this is one of the earliest BBC drama productions archived on film, though BBC technicians opt not to preserve any further episodes of this series.
The Quatermass Experiment: Contact Has Been Established
The BBC airs the first episode of Nigel Kneale’s trend-setting science fiction series The Quatermass Experiment, starring Reginald Tate as Prof. Bernard Quatermass. Broadcast as a live play with minimal footage from other sources played back during air, this is also one of the earliest BBC drama productions archived on film, and one of the final drama productions to use the BBC’s vintage 1930s Alexandra Palace facilities.