Commonly found on moorland where bracken is present and can be seen by day from May to June. Bracken (Pterideum aquilinum) is the preferred food-plant.

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.