Just placemarking as I have no knowledge of modern schools and it's fascinating.
There was none of this at my 80s comprehensive, as long as your skirt/trousers, shirt and jumper were in the right colours and you wore your tie (no problem if you wore it backwards as a skinny tie) you were fine.
You could take what you wanted in for lunch and load up on extra crisps, fizzy drinks, shandy and chocolate at the tuck shop, or Maxpax coffee from the vending machine. Make up, jewellery, white stilettos, Big Hair with enough hairspray to immobilise an elephant, all went unpoliced. Mini skirts were deeply unfashionable so everyone wore pencil skirts.
Smoking was turned a blind eye to as long as people were discreet. They'd never smell it on pupils as the smoke from the staffroom permeated the whole building anyway.
However, the discipline was non-existent - if you weren't in the top stream with the handful of self-motivated pupils, good luck getting any actual work done; and it was a bullies' paradise.
When Ofsted ratings came in some years after I'd left, it went straight into 'special measures' 😆 It's since been knocked down and replaced by a new school