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Don't think you'd ever get Lead that dark. Wing-tips are also too pointed for Lead. You can see slight feathering on the antennae, Lead would have much more.
Thanks Douglas - that's great info. Done plenty of moth trapping in the summer, but never in March, so Drab are unfamiliar territory for me!
Lat/Lng: 53.1513, -1.5614
OS grid ref: SK294616