- The famous imitated line of Michael Caine by Steve Coogan (in The Trip), "She was only sixteen years old!" which Caine never actually said, refers to Petra's character... although she was in her early-twenties playing younger in Get Carter.
- Best known for her relatively small but very important role as Michael Caine's niece in the British cult classic Get Carter directed by Mike Hodges.
- Daughter of the actor David Markham and the BBC scriptwriter Olive Dehn.
- Aunt of Arden Redgrave and Harvey Redgrave.
- In The Deadly Affair (1967), her older sister, Kika Markham, appeared with Kika's future husband, Corin Redgrave, and his younger sister, Lynn Redgrave.
- Younger sister of Kika Markham.
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