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

https://sergionyxy407.tearosediner.net/why-do-some-articles-say-medical-cannabis-is-legalised-in-the-uk

In 2018, UK cannabis law changed through updates to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This allowed specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under Schedule 2 rules