- His partner since the 1960s has been Doctor Who scriptwriter Victor Pemberton. In the 1990s they formed a production company which produced television documentaries, including one on comedian Benny Hill. In recent years they have retired to Spain.
- He started out as a child actor at the age of 11, starring in the title role of the radio play "Just William" (1948). He returned to radio in his later years as a producer of radio plays for the BBC.
- He was the elder brother of Jeremy Spenser.
- Voiced John Richardson in La Déesse de feu (1965).
- Following his success as a child-actor, he was lined up to play parts in Anna Karénine (1948) and Noblesse oblige (1949), which would use some of the same sets. However, a growth spurt made him unsuitable for the roles, and he suggested his brother, Jeremy Spenser, three years his junior, instead.
- His father was Sri Lankan, and his mother was an Italian musician and teacher.
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