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Do you know what plant it was on?
Entomologist and biological recorder
Ash Tree I think
Gardening for Wildlife
I think this is Coronet, but if you have a higher-resolution image that you can upload that might help confirm it.
Compare with coronet here:
I have added some higher res images. Have looked closely at photos and compared with those on the UKLeps site and it looks good for coronet to me. There are a lot of green caterpillars but theere dont appear to be many with hairs like this, also dots and lines appear tobe in the right places!
Yes, I think this is safe to call a Coronet; as you say, the long hairs are distinctive.
Lat/Lng: 54.9839, -4.3978
OS grid ref: NX466681