WOW!!!, I would almost call this the best British Noir, but I'd have to watch
Night and the City again. Anyway this has two titles not to be confused with the Garfield flick of the same name.
http://www.imdb.com/title/tt0039895/
Director: Alberto Cavalcanti, with Sally Gray, Trevor Howard, and Griffith Jones
Storyline from IMDb:
The London Underworld features in this dark and extremely gritty film noir. Trevor Howard plays a cynical ex-RAF flyer named Morgan, bored with civilian life, he joins a break-in gang led by Narcy. On his first job, the getaway car crashes after killing a policeman. Morgan is framed as the driver and sent to jail. Seeking revenge, he escapes and heads for London. Along the way he's helped by a woman (Mrs. Fenshaw), who wants him to murder her husband. In London, Morgan is sheltered by Sally, who falls in love with him. He confronts Narcy and the gang in an abandoned warehouse. Brazilian Director Cavalcanti's great crime drama.
The London Gang in their funeral parlor HQ

Morgan (Howard) during his escape from prison

Narcy the Crime boss

Narcy roughing up Sally (Sally Gray)

The woman who makes an unusual request

Morgan getting his revenge

Its always great to find a Noir off most peoples radar. I enjoyed the story and the cinematography quite a bit the final sequences are a maze of dark alleys waterfronts and railroad viaducts, nice job. The final denouement atop the funeral parlor below.

I'll be looking to pick this one up when I can 10/10