English actor best known for his roles as James Bellamy in Upstairs, Downstairs and Dr. Charles Cartwright in Don't Wait Up.
He attended Harrow School in Harrow on the Hill in west London.
He lent his vocal talents to numerous BBC Radio 4 productions of Agatha Christie novels.
His brother is poet Hugo Williams.
He co-starred with Jean Marsh on the series Upstairs, Downstairs.