Wher I live, half a mile away on Southsea Common we had a group of 'caravan dwellers' just turn up recently and parked for three days on the grass. Then they were gone. No problems as far as I know, just in the minds of other people perhaps?
Anyway, problem solved, the council have placed large rocks along the perimeter of the area. It actually looks good, mum's will love it seeing their little children jumping from rock to rock and it proveds new seating for everyone else as well. OK, a one-off cost, an easy solution, so why do Governments always seem to go for the costly, elaborate and the socially provocative ways of solving a problem? I assume it's their need and desire for power over others and their/our need to be always on the lookout for people that we judge to be 'different' so we can blame them with no conscience problems t0o