Le Prevost was born in Wiltshire. He was educated at Shaftesbury Grammar School, Shaftesbury, Dorset from 1957 to 1961 and at Kingswood School, Bath from 1961 to 1964. At school, he studied Ecclesiastical Architecture, and has said that, had he not become an actor, he would have liked to be an Architect. He trained at the Royal Academy of Dramatic Art.