The problem is, the place will always be 'haunted' by the previous events and ellicit off roading. The guy's a farmer, who tried to diversify, but apparently he wasn't that great a farmer either (RSPCA or something got involved, because of animal welfare issues). So maybe he'll just sell up, or sell/rent all but the farmhouse, and gracefully retire.
There's plenty of sheep farms in mid wales, and plenty of opportunity for farmers to diversify into off roading. There's a reason why all but a handful, don't.