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Flight time seems about right as well. The first moths emerging between the 2 broods of truncata.
At present in the sites where I am looking they all seem to be citrata, Ive been studying the underneath crosslines on many. Also they are nearly all quite dark as above. A very nice looking moth no matter which design you encounter.
Lat/Lng: 55.0181, -6.1131
OS grid ref: NW371770