Flavell was born on 22 February 1898 at 15 Stansfield Road, Stockwell, London (please note that the Daily Telegraph obituary, dated 22.12.93,and most other sources,gives the place of birth as Cookham, Berks. The place of birth is verified from the birth certificate) He was educated at King's College School in Wimbledon, London. Flavell died on 29 November 1993 aged 95. Some sources give 8 November or 1 December 1993 as the date of death.