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

https://wiki-book.win/index.php/Licensed_vs_Lawful_to_Prescribe:_What_Is_the_Difference_in_UK_Cannabis_Medicines%3F

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