This was the story later used in the American film with Burt Reynolds, The Longest Yard. British actor, Tom Courtenay, in his first major film role plays the downcast, but likeable youth from the seedy side of town.
Courtenay's character is saturated with events in his life for which he has no control. He lives in poverty, his father dies, his mother's waiting in the wings-boyfriend is a jerk, and he has no job skills or future. He is ultimately placed in a youth detention facility where he finds, to his warden's joy, that he has athletic ability. He is ambivalent about this skill, but he can obtain privileges and possible early freedom if only he wins the running trophy for the warden.
The Burt Reynolds film, centered on his character developing an interest in his fellow prisoners to decide on how to respond to the warden's promised rewards and punishments. The British version focuses almost completely on the character's internal conflict. Ultimately, his decision is based on how he could best gain an aspect of control in his life. His decision is based not for his peers, and not for the authorities, but for his own sense of self. Aspects of the youth prison may seem funny by today's standard, but the story remains fresh and interesting. I highly recommend it.