Dimbleby was born in 1943. She is the daughter of Thomas Josceline Gaskell (1906-1982) and Barbara Jowett (died 1998), whose father
Percy Hague Jowett was principal of London's
Royal College of Art. In 1948, her mother Barbara Jowett married again, to
Sir William Montagu-Pollock. Dimbleby was educated at
Cranborne Chase School, a former boarding
independent school for girls near
Tisbury in
Wiltshire. Dimbleby's great-grandmother, May Gaskell, was a "romantic confidante" of the artist
Edward Burne-Jones, and a painting of her daughter Amy Gaskell by Burne-Jones is in the collection of
Andrew Lloyd Webber. In 2004, Dimbleby published
A Profound Secret, about May Gaskell's life. ==Selected publications==