High Treason

Anthony Nicholls

Grant Mansfield

Geoffrey Keen

Morgan Williams

John Bailey

Stringer

Patric Doonan

George Ellis

Dora Bryan

Mrs. Bowers

Stuart Lindsell

Commissioner

John Harvey

Scotland Yard Man

Charles Lloyd Pack

Percy Ward

Laurence Naismith

Reginald Gordon-Wells

Jack McNaughton

Benson - Scotland Yard man

Julian Amyes

Slater

Alfie Bass

Albert Brewer (uncredited)

Hélène Burls

Mrs Skinner (uncredited)

Basil Cunard

Pier Superintendant (uncredited)

Harry Fowler

Street photographer (uncredited)

Everley Gregg

Mrs Finch-Harvey - Music Club member (uncredited)

George Hilsdon

Detective (uncredited)

Glyn Houston

Railway shunter (uncredited)

Douglas Ives

Mr Mathews - Union Rep (uncredited)

Moultrie Kelsall

Ship's Captain (uncredited)

Sam Kydd

Sam - Printer (uncredited)

Victor Maddern

Anarchist (uncredited)

Julien Mitchell

Mr Philips - Union Rep (uncredited)

Julian Somers

Scottish Police Sergeant (uncredited)

Marianne Stone

Alfie's Mother (uncredited)

John Warwick

Inspector Hewitt (uncredited)

Lockwood West

Home Secretary (uncredited)

Bruce Seton

(uncredited)

Richard Shaw

Man Dining in Cafe (uncredited)

Howard Lang

Policeman Discovering Jimmy's Body (uncredited)

Pauline Winter

Miss Laurie - Music Club member (uncredited)

Jean Anderson

Woman in street (uncredited)

Hyma Beckley

Music Club member (uncredited)

John Boxer

Ship's radio operator (uncredited)

Cyril Conway

Anarchist (uncredited)

Philip Dale

Man serving in cafe (uncredited)

Andrew Donally

Printer's assistant (uncredited)

Victor Harrington

Police clerk (uncredited)

Stephen Jack

Police Inspector (uncredited)

Barry Johns

Student exiting Tutorial College (uncredited)

Peter Jones

Announcer at Music Club (uncredited)

Howard Lang

Policeman (uncredited)

Frank Ling

Telephone engineer (uncredited)

Harry Locke

Andy - Telephone engineer (uncredited)

Richard Massingham

Music Society member (uncredited)

Dandy Nichols

Woman scrubbing porch step (uncredited)

Tony Quinn

Chemistry lecturer (uncredited)

Bill Rayment

Power station worker (uncredited)

Charles Rolfe

Policeman at Records Office (uncredited)

Reg Thomason

Student exiting Tutorial College (uncredited)

Joe Wadham

Power station worker (uncredited)

Michael Ward

Music Club member (uncredited)

John Warren

Barman (uncredited)

Ian Wilson

Glass collector (uncredited)