In 2018, UK cannabis law was updated through the Misuse of Drugs Regulations...

https://josuedumv023.tearosediner.net/why-are-most-medical-cannabis-prescriptions-in-the-uk-for-unlicensed-products

In 2018, UK cannabis law was updated through the Misuse of Drugs Regulations 2001, allowing specialist doctors to prescribe cannabis-based medicines like Sativex and Epidyolex under Schedule 2 rules