This whole conversation is fascinating. We have a car dependent sedentary lifestyle with ever increasing rates of child and adult obesity and with recreation and many other face to face encounters replaced with a digital interface leading to digital isolation.
Yet here we are limiting the biological necessity of play and the physical activity of children, and totally missing the point that it is the regulatory landscape for urban planning in Britain that has allowed developments to be built that have houses in close proximity with ever shrinking gardens and with poor access to public green spaces that has resulted in this conflict of tranquility vs activity.
It is more productive to channel this frustration into petitioning government to mandate that mini play spaces are constructed within a very short walk of properties in higher density developments so that children can be active and residents can have peace.
Demonising the woman next door for letting her children play - while gratifying - will not combat the drivers of this issue.