I really enjoyed the Dangerous Davies series of whodunits. I have never seen the film of the same name but the series is a keeper and needs to be watched in consecutive order.
If you like Downtown abbey you most likely would enjoy UPSTAIRS Downstairs from the Beeb during the seventies. I think it would age well.
I’m having trouble getting into Upstairs, Downstairs. Too silly for me. I know many folks love it, but I just can’t get into it.