This is a stunningly beautiful moth found in quality deciduous woodland. This type of habitat is rare in the Outer Hebrides. The only record is from Lews Castle woodland in June 2014. The larvae feed on tree species with a preference for oaks (Quercus spp.) and beech (Fagus sylvatica).

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.