Allan Cuthbertson

as Colonel Hall (archive footage) (uncredited)

as Self (archive footage)

as Monty Clayton

as Mr Horrobin

as Chilwell

as Sir Montague Corner

as Mr. Horrobin

as Tillet

as John Califer

as Lord Redesdale

as Chartermain

as Dickie Melborne

as Peter Montrose ("Murder at Midnight")

as Stanley

as Tarquin

as Maj. Daintry

as Colonel

as Colonel Hall

as Lord Redesdale

as Philip Crane

as Gus Ashley

as Philip Crane

as Colonel Wright

as Coroner

as Jarvis

as Jack Newton

as The Lawyer

as Belton

as Hugh

as Lomax

as Adrian Beresford

as Ian Osborn Utley

as Hindsmith

as Captain Douglas

as Dr. Ralph Madison

as Major Cranmore

as Wilkins

as Adrian Beresford

as Colonel Scuttling - Scotland Yard Man

as Geoffrey Plunstead

as Det. Thompson

as Mr. Ballard

as Immigration Officer

as George Aisgill

as Mr MacBryde

as Mr McBryde

as George Sykes, MP

as German Technical Examiner

as Garsden

as Major Donald Ross

as Major Stokely

as Cavendish

as Rupert Bryce

as Smythe

as Prosecutor

as Jenkins

as Housemaster

as Member of Whitehall Conference

as Dr. Fisher

as Mr. Eccles

as Bodley

as Wilkie (uncredited)

as Col. Hannerly

as Da Silva

as Superintendent Symington

as Randolph St. John

as Sylvan-Jones

as Det. Supt. Cowley

as Colonel Stevens

as Captain Patterson

as Maj. Baker

as Lord Melford

as Lacey Marshalt

as Capt. Eric Simpson

as Mr. Wilson

as Henry Matthews QC

as Anthony Hurst, QC

as Capt. Christopher Connaught-Smith

as Monocled Officer (uncredited)

as Sexton

as British Lieutenant

as Captain

as Philip

as Det. Supt. Cowley

as George Aisgill

as Foley

as Guards Officer

as Brigadier's Staff Officer

as Police Inspector

as Chailey

as Captain Donaldson

as Dr. Stevenson

as Det. Inspector

as Foley

as Colonel Packham

as Vice-Admiral

as Metz

as Clifford

as First Gentleman

as Jonathan Redgrove

as Billy

as Henry Carmichael

as Malbete

as Lt. Col. Henniker