A locally common woodland species, which is quite variable in colour. On the wing from June to September in two generations. It’s associated with conifer plantations, including typical plantation trees such as Norway spruce (Picea abies).

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.