that you can do what you like in your own house or garden. If your activities infringe on someone else's life then you can be stopped. By law you are not allowed to affect someone else's quality of life and if having a 12 foot trampoline in your back garden infringes on someone elses space and is detrimental to their quality of life (they will have to prove it) you can be made to take it down. My neighbour has one right next to my fence and it is very annoying having someone jumping up and down and staring right at you when you are trying to enjoy your garden. I haven't complained to her yet, I live in t hope that the novelty will wear of.