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Worth adding again and putting the scientific name down, so that you get the credit.
Edit: I have added it for you, before so many agree with the original that that stays as the ID. It does not really matter, I suppose, but the green variety of the caterpillar is not very common and it would be good to see it appear on the carousel of pics for the species, which won't happen without the scientific name.
My Flickr photos...
Lat/Lng: 51.094, -0.2222
OS grid ref: TQ245342