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

https://wiki-coast.win/index.php/Schedule_1_vs_Schedule_2_UK_Drugs:_What_Is_the_Difference%3F

In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001, not the 1971 Act. This allowed specialist doctors to prescribe certain cannabis-based medicines, like Sativex and Epidyolex, under Schedule 2 controls