Small brown moth with very little patterning. Came to light at moth trap.
No interactions present.
In C. lugula I would expect a much more pointed forewing as well as often a darker colour and white marks along the costa being more prominent.
This is most certainly C. vaccinii.
Thanks for the steer on this one. I wasn't sure about the pointed forewings but I have just found a picture showing the white marks along the costa in the Chestnut. I have added my agreement of your identification above.
Lat/Lng: 52.0463, 1.1901
OS grid ref: TM188434