John Ashdown-Hill
Charles Fraser-Smith
Harry Price
George V
Captain Jack Pearson
Wassily Kandinsky (voice)
Hugo Horton (archive footage) (uncredited)
Sir Reginald DeCourcy
Mr Darrow
John Constable
Professor Stephens
William
Kenneth Baker
Alan Jenkins
Lefevre
Michael Prendergast
Alan the Pipe
Alan Buckley
Alderman Fitzwarren
Maj. Bates
Richard Cannerly
Adrian
Sir Harry
Prime Minister
Prime Minister
Simon
Oswald
John Dashwood
Harry Roberts
Hugh Bonning
Algie
Simon Lidell
James Grahame
Jim Thorburn
Bellhop
Ministry Man
Michael Shanks
