The dilapidated south London adventure playgrounds that I used to play in during the mid 80s would give today's health and safety officers a fit. As would the 25ft high big slide that we used to climb up and sit on the top of the roof. Its gone now unsurprisingly. Nowadays I actually get vertigo at times ... don't know how I ever did some of those things I did as a boy. And dont know how my mum allowed it either
I remember one in Battersea Park which was like walking into a prison and seemed to be controlled by gangs of stick wielding kids who appeared to have their own patches and didn't take too kindly to anyone crossing their turf. Kids looked like they'd been left there for weeks on end and needed to fend for themselves in a horrible dystopian Lord of the Flies- Oz hybrid. My sister and I went a couple of times and then probably not wanting to push our luck, never went back.