In 2018, UK cannabis law was updated through changes to the Misuse of Drugs...
https://blogfreely.net/neasalnfbo/what-is-the-gmc-specialist-register-and-why-does-it-matter-for-cannabis
In 2018, UK cannabis law was updated through changes to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971