I just caught this relatively "minor" British postwar film on TV, and notwithstanding the slightly conservative and paternalistic attitudes noted by other reviwers, I found this an enjoyable and really charming experience, and there are some solid laughs to be had along the way.
Cecil Parker and Celia Johnson acquit themselves admirably as the two probation officers, but the real interest for me lies in the supporting cast. Most notable is the part of the delinquent teenage girl, Norma, played by future superstar Joan Collins in her first major credited screen role. She's not that great, let's be honest, but the camera loves her. Watch out for the beleaguered court sergeant, played by the legendary Sid James, making one of his first film appearances, two years before he became a household name on "Hancock's Half Hour".
A very young, rather chubby-faced, pre-fame Laurence Harvey features as a right bad'un, but the main male "juvenile" role is filled by the wonderful character actor Harry Fowler, a former London newspaper boy (and a direct contemporary of George Cole), who lucked into movies after being interviewed on radio about his experiences of working in London during WWII.
For film buffs, this movie is also really worth watching for several beautiful performances by the supporting cast. Perhaps the most notable among them is the great Ada Reeve, playing Mrs Crockett, an elderly former actress. Its a part that closely mirrored real life - Ada Reeve was in fact a major international stage and musical variety star in the Edwardian era, and there is one very poignant scene in which Mrs Crockett implores a reluctant Mr Phipps to look at her album, which turns out to contain real drawings and a vintage photo of Ada herself as a young star. Equally delightful is the wonderful cameo by the great Katie Johnson as the dotty Miss Macklin; like Ada Reeve, Katie was a veteran star of the British stage, who started out as a child actor in the late Victorian era. This is one of Johnson's relatively few film appearances; her best-known role came three years later with her luminous, BAFTA-winning star turn as sweet old landlady, Mrs Wilberforce, in the Ealing classic "The Ladykillers".
Also, watch out for a terrific cameo by Ursula Howell, playing the drunken, shoplifting society girl, "The Hon. Ursula". She's hilarious.
Despite the somewhat dated social content, this movie has a ton of charm, a good heart, and many lovely performances, both by younger actors on the cusp of future success, and some true veterans of the British stage. A surprisingly good movie.