In 2018, UK cannabis law changed through an update to the Misuse of Drugs...
https://lorenzosuniquenews.rivetgarden.com/posts/why-is-cannabis-illegal-in-britain-a-history-before-1971
In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971