Thank you for the skinny, Mr A! Never heard of it, but crosswords can be very educational. Should have got scoop/dipper.
I found a wonderful place on Crete for the activity, which was suitably private because there is a long walk down to it, including rock scrambling, a sheer rock-face 4 ft drop to the water's edge (OK getting in, needed a rope to get out) and the small inlet of sea soon curved away right out of sight of the "shore". The last time I went was somewhat spoiled by two others doing the same thing, except the lady kept her sun hat on! Lovely memories.