Dingy Mocha Cyclophora pendularia
The dingy mocha is a moth of the family Geometridae. The wings are greyish, thickly striped with darker grey; the markings similar to those of the birch mocha, but the rings are nearly always reddish or purplish, and the central line is wavy. Image: Ilia Ustyantsev (Flickr).
Find out more: iNaturalist, UK Moths