Some great British actors were building their career foundations in this drama about the pressures of life both inside and outside a Borstal reform institution. In particular, Dirk Bogarde makes an excellent scheming manipulator of his fellow inmates while Richard Attenborough is his naive prey.

The Borstal governor and his staff lament that the young men in their charge won't try harder to become good citizens, while the young inmates themselves can't see beyond peer pressure and adolescent rebellion - that much at least hasn't changed since 1949.

But the passage of time has not served this movie well. Its main interest now is historical, in the very early performances of future superstars and in documenting a vanished way of British life and values. We've all seen a multitude of tough prison movies made in later years and in their light this one seems rather pale.