This is the caterpillar of the Grey dagger moth, it was one of several that were making a meal of our small willow tree.
The gets its name from the black dagger like markings on its dusty grey wings, but the caterpillar as you can see is very brightly coloured with a striking red and yellow colour scheme and a dramatic black hump a short way along its back.
This is a fairly common species and can be seen munching on leaves through the summer months from July to October before they find shelter under loose bark or in rotten wood in November where they overwinter as pupae before emerging in spring as a moth.
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