In reply to Chris Harris: There is a one hundred metre waterfall on the west coast of Foula, which runs from the side of Da Sneug hill over the cliff. Often in high westerly winds it just ends up blowing back on the land so does that count?!
In reply to Chris Harris: I live in Morwenstow North Cornwall and there are a couple around, I can't think of the names of all of them but I know one is at the end of the Tidna Valley which is the valley you walk down to get to vicarage cliffs. There are a few which flow into to sea directly at high tide. However they are only small.