In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://jeffreyknev582.yousher.com/why-are-people-saying-uk-medical-cannabis-is-legal-but-not-really
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971