I saw one similar to that, more greyish colouring, today. I think it was an elephant hawk moth caterpillar (no photos, I didn't have my phone handy). It was on one of my fuchsias. Which is fine as long as it doesn't invite hundreds of its friends to dine
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Posts
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.