John King as Sir Rowland Delahaye

John Pelling as Hugo Birch

David Wylie as Jeremy Wallander

Eileen Banfield as Clarissa Hailsham-Brown

Dawn Potkins as Pippa Hailsham-Brown

Hazel Morgan as Mildred Peake

Stanley Jones as Elgin

Bernard Dennehy as Oliver Costello

Joe Billing as Henry Hailsham-Brown

Richard Nicholas as Inspector Lord

Edward Hood, Jr. as Constable Jones