Britain has been visited …
this was spotted mid way on the west coast of Wales over a place called Borth.
It is a cloud called a Lee Wave, of course. These clouds are formed near to mountains on sunny days in particular atmospheres when the wind is just right for gliding. Sometimes they are seen as individual discs and other times they piggy-back - so several saucer like clouds ride on top of each other as with this one. It is alleged that this cloud retained its shape for at least an hour.
Nature is a wonderful thing!