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Mmm ...I should have paid more attention to that. I'm learning slowly. All I can say, it was in long grass below a Sycamore tree.
There's quite a lot of noctuids that feed on grass so that may not narrow it down much in this case! But in general it is always useful to know the foodplant of a caterpillar - you can't always guarantee that the plant you see it on will be its foodplant, but it gives a starting point for identification.
It's also very helpful to get photos from several different angles, as you have done here, to show the markings on the back and sides, and the feet if possible as well.
Entomologist and biological recorder
Lat/Lng: 53.4, -1.7
OS grid ref: SK2697