If you’re genuinely curious about the psychological effects of psilocybin, I’d suggest reading How to Change Your Mind by Michael Pollan. It’s legal, you can read it in your pyjamas, and you won’t get a criminal record. The real magic is in understanding how our brains work, not in eating a fungus that tastes like old socks and might make you think your sofa is a friendly dolphin.
Also, and I cannot stress this enough: never eat a mushroom you can’t identify with 100% certainty. The UK has the Deadly Webcap and Death Cap—named with zero subtlety—which will send you to hospital or worse. One bite of the wrong shroom and your magic journey becomes a very real ambulance ride. So where do you find magic mushrooms in the UK? In a book. In a documentary. In your imagination. Anywhere but in that damp field behind the pub, because you’ll probably just end up as a cautionary tale at a café like this one—while I’m having a laugh at your expense.