On your recommendation dempie55 I've just watched the first 2 episodes of series 1. It's very Miss Marple - and I love Agatha Christie, but possibly because they're set in a bygone age. Yes, it was twee, and slightly irritating, but I expect I'll watch ep 3 & 4 at a later date, so thank you for the heads up.
In a similar vein, I'm looking forward to the TV Richard Coles vicar murders in the autumn because I like the books. I can't take to the Richard Osman books - sorry. However if Chris Columbus is directing the film with an amazing cast (Helen Mirren, Pierce Brosnan, Ben Kingsley, Celia Imrie, David Tennant, Jonathan Pryce, Daniel Mays, Richard E. Grant) I may force myself to reconsider!