Now to us that looks prehistoric. All we can say, at 20 mm, is is a good job it is not 1000 times larger...
Our best ID is that it's the caterpillar of the Garden Carpet moth (Xanthorhoe fluctuate) but, we as always, will correct if this is not the case.
It really was most creepy in the way it moved and then froze into a defensive position. Mind you its what I do when Elizabeth is around with the camera.
