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I've added an example of the larvae of this species (which I think yours is) at http://www.ispot.org.uk/node/255621
Thank you. Really helpful as always. :-)
Pretty sure it's not BBYU, that would have dark area surrounding the spiracles, which are higher up the side in the said species.
There are lots of very similar brown dull 'grub-like' caterpillars in the Noctuidae family. Wouldn't really like to suggest any ID though, as I say many similar species. The very variable caterpillar of the Angle Shades may be one to consider.
An idea of a possible foodplant can be helpful?
It was crawling over the white sheet I had under my moth lamp, so the food plant could be almost anything. Typical (ancient) woodland with oak, birch and plenty of brambles in the immediate vicinity.
Lat/Lng: 52.7, -2.8
OS grid ref: SJ5116