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It's always helpful to give the foodplant for any caterpillar you find. This looks like it might be birch, which narrows things down a bit but not very much - lots of things feed on birch!
Entomologist and biological recorder
Lat/Lng: 54.54877, -1.13127
OS grid ref: NZ562174
Eston Moor, lowland heath. Teesside.