Dunbar was born in Mexico City in 1943, the son of the British filmmaker Robert Dunbar. He has three sisters, Marina Adams, an architect, and twins Margaret and Jennifer Dunbar. He spent his first four years in Moscow, where his father was a cultural attache, before the family returned to England. Dunbar attended the University of Cambridge, where he met the singer Marianne Faithfull. They were married on 6 May 1965, with Peter Asher as the best man, and spent their honeymoo…
