I love the old Ealing films but they aren't Film Noir. A defining characteristic of Noir is moral ambiguity combined with a characterisically American sensibility - which is why 'Kind Hearts' and 'The Ladykillers' aren't Noir when 'Le Samourai' and 'A Bout De Souffle' are (kind of). Altman's Chandler movie was 'The Long Goodbye', not 'The Big Sleep'. There was a 70s version of 'Sleep' but it was set in England and directed by Michael Winner - though it actually followed the plot of the book more literally than the Howard Hawks version.

Not sure if 'The Third Man' counts either - too English, perhaps.