It could be Neither the Sea nor the Sand from 1972 which starred Susan Hampshire
I remember seeing this film in the 1970s. It is a British film, set on the coast, about a woman whose husband drowned at sea, comes back to haunt her. She tells locals that he is back, but obviously no one believes her. I think the film ends when a man helping her (who helps her come to terms with her loss I suppose), forms a relationship with her and her dead husband finally goes back to the sea in peace. I suppose it would have been a variation on the theme of Ghost or Truly, Madly, Deaply.
It could be Neither the Sea nor the Sand from 1972 which starred Susan Hampshire
Sounds like a riff on The Ghost & Mrs.Muir, whatever it is....
Definitely Neither the Sea nor the Sand. Thanks very much.