For NotSpaghetti and "and not all 'gypsies' leave rubbish either". A risky and emotive topic, to raise anywhere, not just GN, but there's a mountain of evidence (& sadly, their accompanying waste) from right round the country that the vast majority are JUST THAT.
I've had to associate with the professionals who get to shift these relentless trespassers and defilers, and they rarely have a good word to say for the people involved. The amount of legal and cleanup costs for private and council landowners comes to many millions, over several decades, and it's US who end up paying for a lot of it.
There is a cosy image that some well-meaning folk maintain, that of a horse-drawn caravan, stops for a week or two on a village green, the chap sharpens some knives, and repairs a wobbly fence or two, then moves on, no rubbish (or toilet evidence!) left at all. IF that still happens anywhere, great.
But that is about one in a million, the vast majority do NOT live like that.