This has been confusing me; I'd love to know what it is!
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It is approx. 18mm in length from a rough scale measurement I've just done. Once again, I don't know the hindwing colour I'm afraid. Is there a way of making the moth open its wings to reveal the upperside of the hindwing without damaging it? Some moths are more obliging than others when it comes to opening their wings!
Yes, using a pencil you can gently move the forewing aside to see the hindwing, this does no damage at all to the moth.
Quite hard to see on this one, but David could well be right with Turnip.
Thanks for the advice Douglas, I'll try it next time I'm trapping.
Lat/Lng: 51.1, 0.2
OS grid ref: TQ5541