- Brother of Jane Birkin.
- He is widely considered the world's leading expert on J.M. Barrie.
- Father of poet/musician Anno Birkin (1980-2001), who died in a Milan car crash, at the age of 20.
- Son of David Birkin and Judy Campbell.
- Worked as a researcher with Stanley Kubrick on his aborted film about Napoléon Bonaparte.
- Cousin of John Birkin.
- He has remained friends with Hayley Mills, whom he dated during the 1960s.
- Grandson of J.A. Campbell.
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