Thanks Adrian, haybales is a good idea
I did find some square bales beside Netherwitton a couple of weekends ago, but that was in the afternoon and I couldn't get back at night. We've had quite a few rainy days in the last week or so, so I think the farmers have been trying to get the crops in as quickly as they can, but there might be the odd field to be found.
I'm hoping to go to
the Robin Hood tree on the Roman Wall at the weekend if the weather's not too bad, it'll be afternoon rather than evening though