Interesting. A litte after that time, aged 13-14, I was interested in coin pusher machines[0], which (despite being gambling) were not age restricted where I lived. Obviously I wanted a way to do better than the system allowed and wanted to know if I could use magnets to pull the coins towards me[1]; some research showed that some "coppers"[2] were magnetic and others weren't, and that it seemed to depend on the date…
https://www.royalmint.com/stories/collect/why-are-some-uk-co... - the composition of 1p and 2p coins was changed from bronze to copper-plated steel in 1992 and the composition of 5p and 10p coins was changed from cupro-nickel to nickel-plated steel in 2011