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Unknown large moth with orange underwing

Observed: 27th August 2013 By: Malcolm Windsor
Unknown large moth with orange underwing
Description:

First saw this moth late last night in the house (windows have been open all day). Still here this morning until let free!
Large est. 40-50mm at wingtips...very active both last night in the dark and today in the day. Strong flyer when set free, flying at about 10ft.
Any ideas?

Identifications
Species interactions

No interactions present.

Species with which Red Underwing (Catocala nupta) interacts