Conkers, bulldog, smoking behind the bike sheds (ok vaping these days), and porn (nowadays on screens rather than naughty magazines) ... a lot about British schools can be summed up in this quote:

“What exactly are you so happy about?' Harry asked her.'Oh Harry, don't you see?' Hermione breathed. 'If she could have done one thing to make absolutely sure that every single person in this school will read your interview, it was banning it!”

And they are generally banned in 1 school from one incident by one head trying to quell anger from parents.

The ban is generally lifted or just not enforced at all after a year or two.

For starters the playground monitors have more important stuff to do than remember the list of banned activities and try to enforce them.