This was the pilot episode for the TV series "Hetty Wainthropp Investigates" with Patricia Routledge. The main differences from the series is that her husband and assistant are played by different actors and that she has blonde/white hair.
Chalky White: [after Hetty jokingly says she a policeman in disguise]
Now, that's a coincidence 'cause I'm searching too for a deeply rewarding relationship with an intelligent, mature woman. You just might fit the bill.