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I can see the logic in identifying by flight season - in the area you have recorded it citrata in October would be unusual. But if identification is done purely on the basis of flight season then unusual emergences or changes in phenology will never be noted.
So by your logic:
It would be less likely to be citrata and more likely to be truncata (due to flight season).
Lat/Lng: 51.4, -0.8
OS grid ref: SU8469