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

https://troyaeco194.theglensecret.com/does-the-uk-medicines-regulator-approve-most-cannabis-products

In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971—to allow specialist doctors to prescribe cannabis-based medicines listed under Schedule 2