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its a fantastic caterpillar, it belongs in the invertebrate section. You could move it there by editing the observation and selecting invertebrates.
Thank you for the information and I have now edited my observation. First time on this site!
Very nice observation for your first one!
This is posted on UKMoths as a dot but looks like a spectacle to me e.g. it has long hairs http://ukmoths.org.uk/show.php?id=5491. I tried to contact Ian Kimber but no reply - what does everyone else think.
I think the larva offered in UKmoths appears to be a Spectacle, going by the difference between it and other Dot moths and the fact that its identical to a Spectacle larva as offered in ukleps.
There is a very nice green Dot moth larva in the selection on ukleps but it isnt like this. Its smoother and less hairy as you point out, the pattern is similar but not identical. I'm just working with the pics I have available. I also have an illustration of Spectacle larva on nettle in 'Collins Field Guide to Caterpillars of Britain and Europe' by Carter and Hargreaves 1986 which fits this a lot better than a Dot Moth.
Lat/Lng: 51.5, 0.7
OS grid ref: TQ9185