In 2018, UK cannabis regulations shifted through changes to the Misuse of Drugs...

https://wiki-mixer.win/index.php/Why_Are_Most_Medical_Cannabis_Prescriptions_in_the_UK_for_Unlicensed_Products%3F

In 2018, UK cannabis regulations shifted through changes to the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971—allowing specialist doctors to prescribe certain cannabis-based medicines