It looks like Kynance has got its sand back.
I recommended a collegue to visit a couple of years ago, and when he went there was hardly any beach left, a storm had washed it all away!
My dad made a similar boob many more years ago by recommending another fantastic cornish beach/bay called Nanjizal (or Mills Bay), when my dad's friend went there was nothing but green, slimy boulders there, where there used to be golden sand, he thought some cruel joke had been played. I guess it had, but only by Nature.