I've been to Yordas a lot over the last year. I found it amazing just how many people visit the cave from all walks of life. Middle aged ladies wild showering, single mum looking for free places to entertain the kids in the holidays, campervanners who'd heard about the place from other campervanners at ribblehead, young men looking for a cool place to smoke dope, etc, etc.
I thought what the place needed was an information board, not just with info on the cave but also encouragement on good behaviour. With the blessing of cncc i approached the NP through the contacts i made when getting similar info sign on the 3 counties system. Unfortunately, the NP no longer support such signage. It is possible to organise privately with the landowner but that also has planning implications. It all became far too much hassle and the idea was parked for the forseeable.
I expect any effort to put in a style would also flounder. Even if it was there would have to be an element which provided for access for all.
I don't think the farmer finds it much of a problem, or not to the extent he wishes to do anything about it. I did notice just last week the farmer left the gate open himself while he went about his business up in the field. I only mention this in case you find the gate open sometime and have a look up the field first before closing.
Yordas is a great asset in the NP and one of the few places where kids, the disabled, beginners, and all sorts of folk can experience a cave. It is sadly not a right, but long may simple access continue.