Sewell was born and brought up in Kensington, London, and educated at the independent Haberdashers'Aske's Boys' School and then Courtauld Institute of Art, where he was tutored by Anthony Blunt and became his close friend.
Sewell was born. Sewell was brought up in Kensington, London. Sewell was educated at the independent Haberdashers'Aske's Boys' School. Sewell was educated at then Courtauld Institute of Art. Sewell became his close friend. He was tutored by Anthony Blunt.