Thanks for all of the comments especially yours Paulo as I had spent 2 days investigating shutter speeds and the effect on perceived water movement. The med is a great place to try this as, for all practical purposes, their is no tide and the water is nice and warm so multiple shots can be taken without having to move up or down the beach and the occasional wet foot is not too serious . This image is my favourite, shot well after sunset the day after the first four. I will look at the first three in light of the "dull" comments but I like them and I was in a very mellow mood at the time (Corsican Red Wine).
Ken