I managed to shoot back up to the field after dog had finished retrieving (she loves it but we still don't have the giving it back bit sussed yet, to put it mildly) and photograph before the frost went.
The old guard hens do not mind the frost. The only weather that makes them reluctant to get out of bed is rainy wind.
The new bods don't quite feel the same. They're not quite used to the change in temperature or the increase in wind. The house is down the hill a bit, but the fields are quite exposed, and the temperature here is usually a couple of degrees lower than in the middle of the village, where they used to live. Pandora was the only one who was anywhere near out. The rest had retired back to the stable. You can see Pandora is missing most of a toe - fortunately it doesn't seem to affect her at all.