This 35mm screening is part of the Kirk Douglas season at BFI Southbank and is also being shown on September 9th. You can find all the details here.
Chicago Reader review:
The most delicate and nuanced of film noirs (1947), graced with a reflective lyricism that almost lifts it out of the genre. Robert Mitchum, a former private eye, has taken refuge from life as the owner of a small-town gas station. A gangster (Kirk Douglas) presses him back into service to search for his wandering mistress (Jane Greer). This is no expressionist thunderstorm of guilt and fate, but a film of small, finely textured effects, centered on subtle grades of morality. The cool, feathery photography is by Nicholas Musuraca; the director is Jacques Tourneur. With Rhonda Fleming, Steve Brodie, and Richard Webb.
Here (and above) is an extract.