The Camberwell Beauty Butterfly is a rare migrant to the UK and as an overwintering butterfly rarely survive our winters. The wingspan is large 60-70mm the males are smaller.
The upper-wings are dark brownish maroon with a pale yellow margin around the edges of the wings separating the maroon and yellow with iridescent blue spots on black. The underside of the wings is blackish brown with a pale yellow margin and well camouflaged when at rest with wings closed. I even thought one had escaped for two days because I could not find it resting. Like most larvae that feed gregariously the eggs are laid in a cluster around a twig feeding on willows, elms, poplars and other trees.