UK cannabis law changed in 2018 when the Misuse of Drugs Regulations 2001 were...

https://dlf-ne.org/what-international-treaties-affect-uk-cannabis-law/

UK cannabis law changed in 2018 when the Misuse of Drugs Regulations 2001 were updated to allow specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex. However, cannabis remains a Class B drug for recreational use