Diane and I found this very tiny caterpillar on the underside of a stinging nettle leaf. I asked Ross Layberry if it could be a question mark larva and he said yes, it most surely is. Stinging nettles are attractive to several butterfly species for egg laying, and an important plant.
Last year, someone took it upon themselves to cut down stinging nettle in the Butterfly Meadow. Why? We have no idea. It was not alongside the path and you had to really look to find it, so it was someone who must have decided that they knew best what should grow in that site. We have more nettles growing in hidden locations and hopefully other butterflies will find them and use them.