This 35mm screening (with introduction by BFI film programmer Kate Taylor) is part of the Big Screen Classics season at BFI Southbank. Full details here.
Chicago Reader review:
'John Cassavetes's first feature (1959), shot in 16-millimeter, centers on three siblings living together in Manhattan; the oldest, a third-rate nightclub singer (Hugh Hurd), is visibly black, while the other two (Ben Carruthers and Lelia Goldoni) are sufficiently light skinned to pass for white. This is the only Cassavetes film made without a full script (it grew out of acting improvs), and rarely has so much warmth, delicacy, and raw feeling emerged so naturally and beautifully from performances in an American film. It's contemporaneous with early masterpieces of the French New Wave and deserves to be ranked alongside them for the freshness and freedom of its vision; in its portrait of a now-vanished Manhattan during the beat period, it also serves as a poignant time capsule. With Tony Ray (son of director Nicholas Ray), Rupert Crosse, Dennis Sallas, Tom Allen, and Davey Jones—all very fine—and a wonderful jazz score by Charles Mingus. It's conceivable that Cassavetes made greater films, but this is the one I cherish the most.'
Here (and above) is the trailer.