Produced as a pilot for a TV series that never materialized.
This TV movie was released as a second-feature in cinemas in Great Britain, where it was made. Its cinema release predates its first US television showing by about four months.
Exterior shots of the manor house, supposedly in Devon, are at Taplow Court in Berkshire. Once home to the family of the WW1 poet Julian Grenfell, at the time of filming, the estate was a telecom research base owned by the Plessey electronics company. Since 1988, it has served as the UK headquarters of the lay Buddhist society, Soka Gakkai International.
Italian censorship visa # 61093 delivered on 5 October 1972.
The "Kcvack" helmet misspelling is a speck of mud partially obscuring the letter "o," which disappears in a different shot.