At first I thought it might have been one of the chestnut-backed forms of Epinotia nisella but later examination of it when it had cooled down in my fridge, suggested Endothenia nigricostana, a species that feeds on hedge woundwort, a smelly labiate that certainly grows in my garden.
If it is nigricostana, there appears to be only three previous Carms records* (with a similar number cited in the Moths of Glamorgan). Click on the pic to enlarge.
* George has since kindly confirmed the i/d and I have replaced the previous photos with a better one.
Looks like it's going to be a hot week ahead!
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