This fairly common species is very similar to (C. elongella) but has specific food plant requirements. Bivoltine: found from June to July and September to October. Birch (Betula) species are the preferred foodplants. Found on South Uist and Benbecula.

References: 
Sterling, P. & Parsons, M. (2023 second edition). Field Guide to the Micro-moths of Great Britain and Ireland.