UK cannabis law changed in 2018 through the Misuse of Drugs Regulations 2001,...

https://zionsniceinsight.readspirex.com/posts/why-is-cannabis-illegal-in-britain-the-history-before-1971

UK cannabis law changed in 2018 through the Misuse of Drugs Regulations 2001, allowing specialist doctors to prescribe cannabis-based medicines. Despite this, cannabis remains a Class B drug for recreational use