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

https://telegra.ph/Has-Private-Medical-Cannabis-Prescribing-Affected-Clinical-Trials-in-the-UK-08-27

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