A very scarce species in the islands, found in damp woodland and flying mainly from May to June. It can look similar to worn examples of some ruddy highflyers and may need dissection to confirm identity.

References: 
Leverton, R. & Cubitt, M. (2024). The Larger Moths of Scotland.
Waring, P. & Townsend, M. (2018 third edition). Field Guide to the Moths of Great Britain and Ireland.