small moth, amazing markings when close, resembles bird dropping!
No interactions present.
Presumably, the English name comes from the white mark within the brown patch on the wing, which resembles a Chinese letter.
The scientific name is a bit vague, but according to A.Maitland Emmet (Scientific names of the British Lepidoptera), Cilix was an inhabitant of Cilicia in SE Asia Minor; or, referred to Cilix, son of Agenor, king of Phoenicia, mythical ancestor of that race. There is no obvious connection with the moth, though!
'glaucata' is easier and refers to anything coloured 'blue-grey'. That would be the colour of the patch visible on the inner edge of the wing.
My Flickr photos...
Lat/Lng: 50.5949, -1.1987
OS grid ref: SZ568775