Oh dear, it did descend into ridiculousness… diabetic character managed to take a trip to France all by himself with no-one to help him with his injections, and then delivered a baby when he came back (he was a retired doctor, who seemed to have lost none of his faculties apart from the original suggestion that he couldn’t remember to take his insulin), in fact the diabetes was never mentioned again, and of course it turned out that the au pair was not the real baddie after all. I won’t add anything else just in case anyone is thinking of watching - it did keep me entertained for a couple of evenings, and there were some plot twists that I really didn’t see coming (although I’m not always very alert to the clues lol), but I’ve seen far better dramas! What actually was going on was not impossible, but really pushing the boundaries in my opinion…
The diabetic grandad was played by David Suchet, of Poirot fame!