In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...

https://jeffreyknev582.yousher.com/why-are-people-saying-uk-medical-cannabis-is-legal-but-not-really

In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001—not the 1971 Act—allowing specialist doctors to prescribe certain cannabis-based medicines like Sativex and Epidyolex under Schedule 2