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

https://www.slideserve.com/eogernrhbu/is-there-a-review-of-the-2018-medical-cannabis-change-happening-now

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