The Monthly Film Bulletin noted: "A sequel to
Jazz Boat, with the same leading characters and production team,
In the Nick is cast very much in the same mould – easy-going mixture of farce and fantasy, loose and ingenuous scripting, excellent (if bizarre) team-playing. James Booth stands out for his genuinely observed portrait of Spider, Bernie Winters appears to be one of those rare comedians who can keep his moronic style of clowning free from offensiveness, and Niall MacGinnis (Governor), Harry Andrews (Chief Officer) and Ian Hendry (rival mobsters) all catch the eye. Anthony Newley is rather at sea as a psychiatrist, but plays with a likable modesty and warmth, and an improved Anne Aubrey discretely burlesques
Jayne Mansfield. There is much in this film that is conventionally weak and structurally uneven, yet it gets closer to contemporary feeling than numerous more ambitious comedies. The dialogue, particularly, strikes an authentic note, and Ken Hughes' debt to
Frank Norman, who wrote the original story, seems considerable."
Variety wrote: "
In the Nick – British slang for in the cooler – suffers somewhat since it explores a joke only recently perpetrated successfully in
Two Way Stretch. ... It lacks star value for the U.S., but U.K. audiences will find it an amusing enough diversion. Warwick has poured its small stock company into the pic and augmented it with some well-tried thesps. Ken Hughes' direction is straightforward and brisk. His screenplay, based on a story by Frank Norman, has the authenticity expected in view of the fact that Norman has become a lively, successful author after several years spent on and off in jails. The story lags towards the end but when it sticks to situation gags it is okay for yocks."
TV Guide noted, "Though there are some genuinely funny moments in the film, Newley is miscast as the compassionate psychologist. Though relatively straightforward for its first half, the plot becomes convoluted and the motivations are twisted in the second half." ==References==