tufted orange and white caterpillar
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That's great, there have been several commas flying here in recent years so it seems plausible from that too.
About a week after I posted the observation this caterpillar (and two others) pupated on the sapling. We watched them carefully and then on 19th August the first butterfly emerged with wings closed and hung directly on the now empty pupa, just after lunch we went out and moved it into the sunshine and within a few minutes its antennae slowly moved out from lying parallel with the leading edge of its wings to a more alert position. Then after about 30 seconds there it suddenly trembled all over and seperated the still closed wings so that the front wings were clearly stretched out from the back wings. The trembling declined and after about another minute it opened the wings, climbed round onto the top of the twig with its wings held flat to the sunshine and in the blink of an eye was gone!
Lat/Lng: 52.63443, 1.31387
OS grid ref: TG243092
Two of these appeared on a seedling of an unknown tree growing in a plantpot. I think the tree is a variety of elm from the seed but I'm not sure.