In 2018, UK cannabis law changed through an update to the Misuse of Drugs...

https://wiki-coast.win/index.php/Why_Does_the_UK_Keep_Cannabis_as_Class_B%3F_Understanding_Drug_Classification_and_Policy

In 2018, UK cannabis law changed through an update to the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971—allowing specialist doctors to prescribe cannabis products classified as Schedule 2