- Country: UK
- Genres: Drama
- Release: 1934-11-26
- Director: T. Hayes Hunter
- Writers: Charles Bennett , Billie Bristow , Denison Clift
- Language: English
- Stars: Edmund Gwenn , John Loder (1898–1988) , John Loder (1898–1988) , Leonora Corbett , D.A. Clarke-Smith , Garry Marsh , John Turnbull , Raymond Lovell , Douglas Stewart
- Runtime: 68 min
- Awards: N/A
- AKA: Warn London (United Kingdom) , Warn London
- Plot: N/A
- IMDB:tt0025959
Warn London Cast
T. Hayes Hunter
Director
Edmund Gwenn
Dr. Herman Krauss
John Loder
(1898–1988)
Inspector Yorke
John Loder
(1898–1988)
Barraclough
Leonora Corbett
Jill
D.A. Clarke-Smith
Dr. Nicoletti
Garry Marsh
Van Der Meer
John Turnbull
Inspector Frayne
Raymond Lovell
Prefect
Douglas Stewart
Davis