Hi, wonder if anyone can help. I recall seeing a b/w british motorcycle movie in the 70's on TV, with a gang of ton-up boys (and girls!) who

sing some kind of chant (don't quote me on this!) 'Black leather, black leather, crack, crack, crack!?' There is a scene where a man is beaten up and an Indian doctor rushes to his aid explaining that "he was beaten up by Teddy Boys!!' I always thought that this was the 'Leather Boys (1962) seeing it recently, i realised that this must have been a completely different film. Anyone out there who can help pse????