Joseph O'Conor
as Sir Edward Julyan
John Vernon
as McKee
Edward Hardwicke
as Mike McCarthy
Joss Ackland
as Chief Supt. Wray
Donald Pleasence
as Cedric Harper
Joyce Carey
as Miss Monley
Clive Revill
as Alf Chestermann
Delphine Seyrig
as Ceil Burrows
Janet Suzman
as Alex Tarrant
Catherine Schell
as Lady Melissa Julyan
Denis Quilley
as Bateson
Derek Newark
as Monitoring Policeman
Maureen Pryor
as Jane Harper
Preston Lockwood
as Ilkeston