In reply to DEL_35:
I started a thread on this in the summer. She's been around for years.
She is not the farmer - but is acting as a self-appointed agent. She has a letter of permission from the farmer which she is reluctant to show people because it is several years old now. She doesn't seem keen on getting another one. The farmer is not allowed to have camping on his land without providing facilities, so she says that she is technically fining people who stay there.
I
think you are under no compulsion to pay her, although it wouldn't take much for the farmer to ban any kind of camping and bivvying, and paying her is probably the safest option. The question is, how much sway she has over him - I suspect not a great deal - but it would be a shame to jeapordise such a good spot.
Last time I was there I thought she'd gone too far by getting a pound out of some Germans who were sleeping in their Land Rover parked in the lay-by.
Getting up early and leaving solves the problem. She comes round 730-800 kind of time.