small green caterpillar about 1.5 to 2 cm
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I think your caterpillar is that of Angle Shades, a moth. The Small White overwinters as a pupa and although green in colour it doesn't have the white stripe along the side.
Duly noted and agreed,stated what i thought the obvious but never checked.
Thanks for putting me right
Lat/Lng: 50.4, -3.6
OS grid ref: SX8962