Common in the southern islands with an increasing number of sitings farther north. On the wing from June to August, they lay their eggs near the food-plants, violets (Viola spp.). Once the eggs hatch the larvae immediately hibernate until the spring.

References: 
Kirkland, P. (2022). Discovering Scotland's Butterflies.
Newland, D.E. (2006). Discover Butterflies in Britain.