Grandmabatty
Sharr, the original story doesn't have Marple or Poirot either.
I didn't think it did, either.
It's based on an Inspector Battle book, isn't it?
I liked the scenery as I know the coastal area but to my mind it wasn't shown off to its best in this production. As for frequent drownings that were mentioned when trying to get across to the island, well, you can walk across when the tide's out or go on the wonderful tractor.
I didn't remember a house like that being on the cliff either but apparently that's located somewhere else, Wiltshire, possibly.