NO i would never grass on anyone for anything unless they where a nonce and even then i would get something sorted rather than grass.
Look at it this way, would you like someone telling tales about yourself?. Of course not. So why some folks think they are superior to anyone else is stupid. take a bullet in the head and your dead no matter what your worth, no matter how big or small etc.
You can only be responsible for your own actions, what others do is none of anyone elses business.
Why would you want to cause friction with your neighbours. you never know but you might have a neighbour who's a headcase, the neighbour might have kids and those kids would suffer if the parent got a fine. That neighbour could one day save your life or help you out, Imagine you had say a heart attach the neighbour would probably call an ambulance. Piss the neighbour off by grassing and they would probably just laugh and say serves you right.
@3dj they may be travellers, if they are travellers you will be making a massive mistake. I live 10 mins walk away from a travellers site, and i have known some of them since my teens. I always showed them respect and i helped a couple of them out in a brawl once, needless to say there was a counter reaction to that and the travellers went a kicked some serious ass. I never payed to go on the fair when it was in town after that and one thing they hate is a grass. I would just leave them be for your own good mate.