The long arm was the original British title, (USA The third key).
Ealing studios, available on DVD in UK in The Ealing Studios Collection.
Jack Hawkins later re-used his detective character as Gideon in a series of crime fiction films from the books of JJ Marric.
After the Milner name became known publicly, there was a crisis of customer confidence in Milner safes. Hall Agregates which owned both companies, soon merged Milner and Chatwood.
Soon after that, Chatwood-Milner joined the Chubb Group.
Some of the story of the police investigation is recounted in FIRMIN Men in the shadows, and GOSLING Ghost Squad. See also, KIRBY Scotland Yard’s Ghost Squad: The Secret Weapon Against Post-War Crime.
The ‘Ghost Squad’ was the British police’s first undercover squad.
