Dear Murderer (1947) British crime film noir

Dear Murderer (1947) is a British crime film noir starring Eric Portman and Greta Gynt.
Lee Warren (Eric Portman) and his wife Vivien (Greta Gynt) are having marriage trouble with Lee’s jealously and Vivien’s unfaithfulness and devious personality. Lee eventually has had enough and after finding some what looks like love letters to Vivien he decided to kill her latest lover Richard Fenton (Dennis Price).