The two Copper Underwings are tricky to identify. The safest way is to examine the underside of the hindwing. This is not easy on live specimens but unless it is done then records of the two have to be grouped under this aggregate.
Recorded in 83 (59%) of 140 10k Squares. First Recorded in 1926. Last Recorded in 2020. (Data up to end 2019) Additional Stats