In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://ameliasnicedigest.swiftnestly.com/posts/why-is-the-licensed-vs-unlicensed-point-so-misunderstood-with-uk-medical-cannabis
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971