beware of courting couples in hedges or divers below the surface of the water.
Won't
"courting couples in hedges" have better things on their minds than trying to take the registration of a low flying aircraft?
"divers below the surface of the water"
And, if you're over the sea, there's submarines to consider, of course.
I don't think even the CAA would try to base a prosecution on people or vessels under the water.
Remember the Golden Rule:If you're going to fly low, breach Rule 5 or risk breaching Rule 5, don't stay in one area for too long or you'll increase the risk of some well-wisher getting your regn and reporting you.
FL