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This looks rather like the sawfly observations that have recently been added to iSpot. However, they were of an Oak feeding species and the leaves here don't look lke Oak.
did you mean Periclista pubescens?
Found a few of them and they were under oak so could have fallen off, they were actually on brambles. as you can see by the size of leaf the caterpillar was quite large
Lat/Lng: 51.9565, -0.655527
OS grid ref: SP924295