In 2018, UK cannabis law changed through the Misuse of Drugs Regulations 2001,...

https://zulu-wiki.win/index.php/Sativex_vs_Epidyolex:_What_Is_the_Difference%3F

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