In 2008, Hattersley appeared in a documentary on the DVD for the Doctor Who serial, Doctor Who and the Silurians, to discuss the political climate that existed at the time of making the serial.
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The 1970s Doctor Who stories to have undergone the VidFIRE process are: Doctor Who and the Silurians, The Ambassadors of Death (episodes 2-7: 1 remains on original 2" tape), Inferno, Terror of the Autons, The Mind of Evil, The Claws Of Axos (only Episodes 2-3), The Daemons (only Episodes 1-3 & 5), Planet of the Daleks (only Episode 3) and Invasion of the Dinosaurs (only Episode 1).
Crumhorns were used in Doctor Who and the Silurians as a theme for the reptile men and in his final score for the series, Revenge of the Cybermen in 1975, he made use of serpents and ophicleides whenever the Cybermen appeared.