Knowing that some species had Aspen as a foodplant, I set the moth-trap under the trees on a number of occasions. I made a mental note that a moth I had never caught, Lead-coloured Drab, was also an Aspen feeder.
So, with a reasonable evening forecast and the temperature holding up, I went to Pilmoor and set up the 160 watt MBV over a sheet, which soon started to draw Orthosias in. While inspecting the sheet, I noted a slightly smaller drab, similar to a pale Clouded Drab, but this had the more rounded termen, and a distinct neat line of dots inside the sub-terminal line. It immediately stood out as being interesting, and despite prodding, I could not get to see the antennae which would have clinched it.