Credited theatrical movie debut of Dame Joan Collins (Norma).
During the scene in which Phipps tries to stop Hooker and his mates from hijacking the truck filled with scotch, Hooker and Phipps are seen running past a large lorry emblazoned with the brand name "Ultra Television". This may have been a deliberate product placement - Ultra is a real British electronics company, founded in 1920 and still trading. The company became well-known for its successful brand of radios, and was one of the first UK companies to manufacture televisions in the 1950s. Ultra subsequently diversified into aviation electronics and is now one of largest firms of its kind in the world. The company name changed after it was bought out in the 1970s but reverted to Ultra after a management buyout in the 1990s.
In her biography Past Imperfect Joan wrote that Celia Johnson was extremely kind and thoughtful toward her and was helpful and patient. Their scenes together were enjoyable and a wonderful learning experience.
Harry Fowler had a long career as a juvenile and carried on playing these parts for years. He was 26 when this film was made. Joan Collins was 18 and Lawrence Harvey 23. Very few films about the gritty lives of young people, made at the time used people that were age appropriate.
Although the film is set 'South' of the River Thames the majority was filmed in several locations north of the river. Many were where located in the Royal Borough of Kensington and Chelsea and Borough of Westminster. Also Ealing near the film studio. The scene with Harry Fowler and Joan Collins at a swimming pool was filmed at a pool called the Oasis which was in central London just opposite the famous Shaftesbury Theatre, Shaftesbury Avenue.