I saw this film many long years ago under a different title. In America it was released about 1965 as "Walk in the Shadows." It's one of Patrick McGoohan's (The Prisoner) early films. It's now available on DVD. From a review:
Life For Ruth is set in early 60s Durham - not really kitchensink, but with enough realism to make it very believable. The tale revolves around Ruth, an eight-year-old girl and daughter of John Harris (Michael Craig) and Pat Harris (Janet Munro). Playing on the beach, Ruth loses her ball and sets out in a rowing boat with a friend to retrieve it. John Harris spots them in danger, swims out to rescue the pair, but only succeeds in saving the boy - his daughter Ruth is rushed to hospital.
A blood transfusion could save Ruth, but John refuses - he is a member of an unnamed religion that opposes such a thing. Despite the protestations of Doctor Brown (Patrick McGoohan), he maintains that his daughter cannot have blood, fearing it will stop his daughter from enjoying eternal life. Ruth dies - and the doctor wants John Harris to face charges for his actions. The case does go to court, with the jury asked to decide between the legal obligation of a parent to his child or the moral obligation Harris feels towards his religious beliefs.
There's a You Tube selection up:
It's been so long since I saw this that I don't really remember what I thought at the time. I was a JW then so my viewpoint would be different now. I thought, though, it'd be of interest to some here and perhaps others have seen this and can comment on it.