Continuing to read Celia Johnson's biog. by her daughter Kate (slow reader - nearly at end!) and an odd coincidence that wouldn't have register with her at the time of course, but she was starring in the theatre play of "Lloyd George Knew My Father", which is about Lord and Lady Boothroyd (Ralph Richardson) doing anything they can to stop a bypass being built through their estate.
She then goes on to say that at that time she made friends with this new 22 year old actor Simon Cadell, who helped her, now widowed, with lots of things (don't go there you naughty person), and of course Simon played 20 years later a major part in "Blott On The Landscape", which was basically the same story.
I wonder if Simon realised this plagiarism?