I remember the clackers & their banning.
The senior school I went to had builders in, and suddenly everyone had 'split bullets' - the cartridges used to work heavy duty nailguns - that would give a tremendous explosion when hit properly with a brick. They lasted just a few days before the teachers got wind and confiscated them with dire threats of punishment for anyone caught with them. Not unreasonable considering how dangerous they must have been.
Clothing wise we saw some odd fashions. High waisted trousers with a waste band up to 4" wide. Girls summer dresses with a full length zip at the front and a large metal ring attached to the zipper (practically shouting PULL ME!). The art of knotting a tie so that no more than about 6 inches hung down. Later on there was a fashion for wearing poloneck jumpers under shirts, often with a wide studded leather watch strap OVER the left cuff - bad news if you couldn't cope with the warmth.
One summer everyone seemed to have magnifying glasses, and was trying to burn each others clothes, hair, skin, whatever was accessible. You learned never to leave a hand still for a moment in direct sunlight or else.
We went through a phase of pea-shooters, with everyone buying split peas from the local gardening suppliers. That morphed into spit balls a year later, with empty Bic pens being used as the firing tube. Then later again the postmen started using heavy duty rubber bands, and a couple would be linked and used to fire V-shaped folded pieces of paper at high speed that could cause a nasty bruise or burst a balloon.
We had a large influx of people from Jamaica and Tobago who initially integrated very well. Later the kids we'd played happily with started to discover their own cultural identity, and a kind of patois spread, with the 'cool' white kids also declaiming "jah, guy" and calling people they didn't like a "Raas claat".
Then there was the 'Chinese martial arts' phase, where everyone had to learn some kung-fu moves or re-enact scenes from The Water Margin (a sort of Chinese version of medieval X Men) on TV.
There was a craze for pythonesque humour. Every skit created for English lessons was python-style. Inanimate objects would be given complex names, like a brief case called Horatio Nyus the 3rd. Various school children would wander the town exclaiming to passers by, words selected for their double entendre potential whilst being innocent in themselves. Life was happily surreal in South Norwood.