Una you might like the BBC show Mrs Wilson set in the 1960s with flashbacks from the 1940s.

"Alison Wilson thinks she is happily married until her husband Alec dies and a woman turns up on her doorstep claiming that she is the real Mrs. Wilson. Alison is determined to prove the validity of her own marriage - and her husband's love for her - but is instead led into a world of disturbing secrets."