Caloptilia hauderi - Only the second record in Kent that I am aware of although it's undoubtedly under-recorded. This from ukmoths: "A very local species, occurring in a small number of localities in the south. It is known from the Isle of Wight, and West Sussex. Elsewhere it is found in the Pyrenees of southern France and from Austria where it was first named.
The adult moth is fairly distinctive, having a rectangular yellowish blotch against the forewing ground colour of brown or chestnut, and occasional smaller yellow markings."
Treated by some as a form of Caloptilia stigmatella though a paper on the subject is currently in press.
The moth was taken at light in my Paddock Wood garden on 11th July.