I actually spotted this little caterpillar nine days ago, on 16 January, but have struggled to put a name to it (I have a caterpillar guide book but the illustrations are so small that I find it difficult to distinguish between the many green caterpillars). I wondered if it might be a Silver Y moth (Autographa gamma) and some of my social media contacts agreed, though I’m still not entirely convinced. It was munching on the leaves of an Aquilegia that had escaped the confines of someone’s garden bed.