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I assume this one is old & faded?
I have had Pebble Prominent before but they have always be more clearly marked - http://www.ispot.org.uk/node/50850?nav=related
Wildlife of Assynt
yes it looks like the scales have become scraped off part of the left forewing, although the right forewing shows the more normal pattern
Thanks, Added a forth photo of one that can to light trap last night showing more normal patterning
Lat/Lng: 58.1, -5.3
OS grid ref: NC0720