Green caterpillar swept from an Evergreen Oak tree.
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Thanks so much, Nightfly - it looks like that's teh one, and the foodplant is ok, too.
That rear white band is such a good feature, ukleps say its distinctive. Without it this could be a hard cat. to ID!
Lat/Lng: 50.6767, -1.5396
OS grid ref: SZ326864