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Although Common is the most likely (as it has no dark markings on the upperwing) I think a shot of the hindwing would be desirable to eliminate Smoky with certainty.
I ve just found this a long time after posting. I'd tend to agree that a view of the hindwings would be desirable here to be sure of what this is.
Is it possible in some cases to determine an ID of Common Wainscot without seeing the hindwings? Apologies for the confusion, I think it was Davids comment on this observation which got me looking at hindwings of all Wainscots from then on.
Generally I would say Common Wainscot has a 'cleaner' upperwing and Smoky has more dark markings. But as most sources recommend checking the underwing I'm guessing that is not reliable - although it may be that the extremes of the range can be done.
I wouldnt be certain at all of my ID above as since I started checking hindwings, Ive found them to nearly always be grey and therefore Smoky Wainscot. Thanks David.
Lat/Lng: 55.014, -6.15
OS grid ref: NW347767
Heather moorland and conifer plantation.