Thistle Ermine Myelois circumvoluta
Wingspan 27-33 mm.
This is a very distinctive moth, rather reminiscent of a larger version of the Yponomeutidae family.
As the name suggests, the larval foodplants are various types of Thistle, and the moth is distributed over the southern half of Britain in habitats where the foodplants grow.
Flying in June and July, the adults can be attracted to light.