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Acronicta rumicis perhaps?
I'd be willing to go out on a limb and agree with this, though Teasle (i think that is the plant it's on?) seems a bit of an odd food-plant for it.. Stranger things have happened!
I don't suppose it is in your back yard and you might be able to get a slightly clearer photo?
Lat/Lng: 49.7, -7.6
OS grid ref: SU9703