In 2018, UK cannabis law changed through an update to the Misuse of Drugs...

https://sethsinterestingthoughtss.evergrovio.com/posts/what-happened-in-the-child-epilepsy-cases-that-pushed-the-2018-change

In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971—allowing specialist doctors to prescribe cannabis-based medicines under Schedule 2