In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://tiny-wiki.win/index.php/Do_You_Have_to_See_a_Specialist_Doctor_to_Get_Medical_Cannabis_in_the_UK%3F
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971