Least Black Arches
I also found this larva near my MV trap on Wednesday evening. It looked vaguely familiar, but I just bunged it in a tub with some weeds and grass to check it out later.
Usually any moth larvae I find in the garden are either generalists that I can rear on pretty much anything, or I find them on a particular plant anyway and use that to rear. This one though was not touching anything. I checked it in Porter this evening and remembered what it is, one that I have seen before but a new breeding record for the garden - Centre-barred Sallow. It must have fallen or got blown out of the ash tree in my garden as it should be feeding on the buds at the moment. I've released it back on to the tree to fend for itself.