If I was one of the British farmers I would have pressed charges on them and then see if they would still claim them.
There is no them, that's your problem. No them, no reproduction - ever - under observed conditions. Not even with a $100K reward for proving it possible under actual conditions of reproducing an existing one. Not in 20 years - zip.
No one to sue.
Do I actually really seriously have to put a giant sarcasm tag on these posts?
Or is it you really think thay every damn one of these crop formations is just a product of nocturnal hoaxers?