as Colonel Hall (archive footage) (uncredited)
as Self (archive footage)(1 ep)
as Monty Clayton
as Mr Horrobin
as Chilwell(4 eps)
as Sir Montague Corner
as Mr. Horrobin(1 ep)
as Tillet(2 eps)
as John Califer
as John Callifer(1 ep)
as Lord Redesdale
as Chartermain
as Dickie Melborne
as Peter Montrose ("Murder at Midnight")
as Stanley
as Tarquin(7 eps)
as Maj. Daintry(1 ep)
as Colonel
as Colonel Hall(1 ep)
as Lord Redesdale(1 ep)
as Philip Crane
as Gus Ashley
as Philip Crane(1 ep)
as Colonel Wright(1 ep)
as Coroner
as Detective Sergeant(1 ep)
as Jarvis
as Jack Newton(1 ep)
as The Lawyer
as Belton
as Hugh
as Adrian Beresford
as Ian Osborn Utley(1 ep)
as Hindsmith
as Captain Douglas
as Dr. Ralph Madison(1 ep)
as Major Cranmore(1 ep)
as Wilkins
as Adrian Beresford(1 ep)
as Colonel Scuttling - Scotland Yard Man
as Geoffrey Plunstead(1 ep)
as Det. Thompson
as Mr. Ballard
as Immigration Officer
as George Aisgill
as Mr MacBryde
as Mr McBryde(1 ep)
as George Sykes, MP(1 ep)
as German Technical Examiner
as Garsden
as Major Donald Ross(2 eps)
as Major Stokely(1 ep)
as Cavendish
as Rupert Bryce(1 ep)
as Smythe
as Prosecutor(1 ep)
as Jenkins
as Housemaster
as Member of Whitehall Conference
as Dr. Fisher(1 ep)
as Mr. Eccles
as Bodley
as Wilkie (uncredited)
as Col. Hannerly(1 ep)
as Da Silva
as Superintendent Symington
as Randolph St. John
as Sylvan-Jones
as Det. Supt. Cowley
as Colonel Stevens(1 ep)
as Captain Patterson
as Maj. Baker
as Lord Melford(3 eps)
as Webster(1 ep)
as Lacey Marshalt
as Capt. Eric Simpson
as Mr. Wilson(1 ep)
as Henry Matthews QC(1 ep)
as Anthony Hurst, QC(1 ep)
as Capt. Christopher Connaught-Smith
as Monocled Officer (uncredited)
as Sexton
as British Lieutenant
as Captain
as Philip
as Det. Supt. Cowley(1 ep)
as Lacey Marshalt(1 ep)
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(1 ep)
as Mr. Pritchard(1 ep)
as Colonel Packham
as Vice-Admiral
as Metz(1 ep)
as Clifford
as First Gentleman
as Jonathan Redgrove
as Billy
as Henry Carmichael
as Malbete(1 ep)
as Lt. Col. Henniker