Oh so many happy childhood memories here. I grew up in North East London and my Mum didn't like the local kids, considered them to be common and rough, so wouldn't let them call for me, always sent them packing! But she approved of one girl whose parents were 'business people' so I was allowed to call for her and visit her home. But we weren't t great friends so she didn't often call for me. But I would tell Mum that was where I was going and then I'd be off round the neighbourhood calling for whoever I liked, usually boys, their games and toys were more fun! We did all the things other posters have mentioned, also scrumping apples and pears, playing 'knock down ginger', playing cowboys and indians with cap guns, and exploring a large empty estate house which we believed was haunted and building campsites and bonfires in the grounds. Oh happy days! You can tell I was a real tomboy. I think that freedom to roam and choose my own friends made me more streetwise and increased my confidence as I was growing up. My Mum never knew what I got up to and was quite shocked when she did find out when my own children were young, hard to believe she never knew.
When I had my three sons in the 70's I allowed them to play out and call for their friends, with the usual parental warnings to behave themselves and stay out of the river. But I know they got up to all sorts of mischief, and so long as it wasn't (too) illegal or dangerous I turned a blind eye. Only twice did I have to wade in 'guns blazing' to rescue them from an angry neighbour. Just part and parcel of being a parent and they still remember it with amusement today.
Our youngest son's children enjoy a similar level of freedom, but the other GC less so. As someone else said it seems to be all supervised playdates now, not quite the same. I sometimes wonder if limited independent activity and decision making impacts on children's confidence, anxiousness and mental health in young people today.