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

https://wiki-canyon.win/index.php/Does_the_Government_Have_to_Follow_ACMD_Advice%3F

In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. This allowed specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex