This 35mm screening is part of the Love (Fools for Love) season at BFI Southbank. You can find the details here.
Chicago Reader review:
Woody Allen strode into his ambitious period by finally acknowledging his own attractiveness to women—by reversing the humor of sexual embarrassment that defined the early comedies and substituting the pain of romantic longing. Though this 1977 film is snobbish about fads, its own attitudes often seem narrowly fashionable: the characters yearn for commitment but spend most of their energy on what once was known as “self-actualization.” Visually and structurally it's a mess, but many of the situations are genuinely clever, and there are plenty of memorable gags. The perpetual problem is that Allen isn't nearly the thinker he thinks he is.
Here (and above) is the trailer.