Blair's Mocha Cyclophora puppillaria
Wingspan 28-36 mm.
This is a continental species, and is only a rare immigrant to the British Isles.
There have been a hundred or so records since the first in 1946, most of which have occurred on the south coast, although some have turned up inland and further north.
The specimen shown was photographed in southern France.
On the continent, the larval foodplants include evergreen oak (Quercus ilex) amongst others.