Dr Grimsdyke (Leslie Phillips) is released from prison (where he was the prison doctor not a convict!) He is immediately snatched up by Sir Lancelot Spratt (James Robertson Justice) to work in his hospital. Grimsdyke is fairly uninterested in this, though interested in French physiotherapist Jeannine (Elizabeth Ercy) a lot!
Meanwhile, a new matron (Joan Sims) has arrived at the hospital and has begun a reign of terror. Sir Lancelot thinks the iron maiden can be melted with a love interest and gets Grimsdyke to try and hook her up, though he didn't think that he would be the one Grimsdyke would get Matron interested in!
So, this is a silly comedy in the great British way. We get lots of farces, a little bit of innuendo and plenty of light humour. It is all nonsense of course but very silly inoffensive fun. Don't expect much in the way of medical realism, do expect people being accidentally injected up the backside.