Lesley.
I too, cannot understand why we have spent £millions on thousands of windmills at sea, gambling on wind power, when they could drop the blades into the sea and get guaranteed 23 hrs of tidal power per day?
I am sure it is not that easy or cheap but why was uncertain wind power, chosen over certain tidal power?

"My New Year's Resolution, is to try and emulate Marek's level of chilled out, thoughtfulness and humour towards other forumites and not lose my decorum"