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Many thanks for your advice on this one. Your ID does seem more likely , but no, I didn't check the abdomen colour. I didn't disturb the moth which came to lights overnight and settled on a patio pot plant, and it flew off after the sun had been up for while. I did see several last summer though and will look more carefully next year!
Nick Upton, naturalist and photographer.
Lat/Lng: 51.4, -2.3
OS grid ref: ST8167