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This looks like a sawfly larva to me similar to one I posted some 2 years ago heres a link
the larva looked very like this at times and often basked on other plant leaves .
This one looks more like a moth than a sawfly to me, although I'm not certain. If you have any photos showing the legs that would clear it up. Do you know what plant it is on?
Entomologist and biological recorder
Lat/Lng: 52.364, -6.3713
OS grid ref: SM025829