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Please can anyone say what caterpillar this is?
It is the caterpillar of a vapourer moth, Orgyia antiqua.
The larvae photos there give the impression the pale tufts are straw coloured, whereas often they are a pale lemon yellow, like yours.
(scarce vapourer moth is different)
You'll see from this discussion that they (the larvae) will eat a wide range of trees & shrubs
Beware the hairs. They are there (as with many hairy larvae) partly to deter predators, and in humans they can induce a skin rash.
Thank you so much. i did not know that caterpillars could do that so glad I asked!