Ask a Scots Law Question, Get an Answer ASAP!
Is this person paying for the services at the moment?
You can serve notice on them to vacate the pitch for not complying with site rules but you can't turn off the services as you have no legal basis for doing so. Although, I would comment that doing so is more likely to work so you might want to maintain this stance and see if they capitulate. You are certainly not breaking any criminal law.