Where did you find it?
Interesting,I catch this moth regularly where I live in Pembs, but I'm not sure than anyone else in Pembs catches it much. I've just noticed that the foodplant is Marsh Woundwort and maybe that explains it - the garden is full of Marsh Woundwort. It grows everywhere, even in dry areas, and spreads by root fragments. I welcome it as the flower is very attractive and pokes up happily between other plants. It is a distinctive moth and can be identified by shape even when worn.