[1][2] Flood was born in Portsmouth, Hampshire, but lived for most of his life in Farnham, Surrey, where he regularly appeared on stage at the Castle Theatre.

[5] He came to national prominence whilst starring alongside Patrick Allen and Sam Kydd in the Morocco-based police series, Crane, which ran from 1963 to 1965 on ITV.

[6] In 1957 he performed in the pantomime Mother Goose at the Connaught Theatre in Worthing, Sussex, England with Douglas Byng, Eve Lister, Ann Lancaster, Rosalie Ashley, Reg Thompson, The Hedley Ward Trio, and Roland Curram in the cast.

From 1959 to 1960 he acted in Graham Greene's play, The Complaisant Lover at the Globe Theatre in London, England with Ralph Richardson, Paul Scofield, Phyllis Calvert, Lockwood West, Helen Lowry, Polly Adams, Hugh Janes and Oliver Burt in the cast.

[7] In June 1967 Flood took over from Donald Sinden the role of Robert Danvers in the hit comedy There's a Girl in My Soup, at The Globe (now Gielgud) Theatre in London's West End, which he played until December 1968.

In 1974 he acted in JB Priestley's play, Dangerous Corner, at the Yvonne Arnaud Theatre in Guildford, Surrey, England with Rachel Gurney, Barbara Jefford, and Christopher Good in the cast.

[3] Originally, the character was to have been featured more heavily in other serials but his scenes were either edited out for timing reasons or dropped due to the difficulty in operating the Kamelion prop.

He portrayed Sir Richard Flashman in the BBC's popular 1971 television serial Tom Brown's Schooldays and was also in Bachelor Father.

Flood also appeared in Steptoe and Son, Raffles, Crown Court (TV series) ('Murder Most Foul' episode), Two in Clover, 'The Madras House and Comedy Playhouse.