In 2018, the UK amended the Misuse of Drugs Regulations 2001 to allow...

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

In 2018, the UK amended the Misuse of Drugs Regulations 2001 to allow specialist doctors to prescribe cannabis-based medicines, while recreational cannabis remains a Class B drug under the Misuse of Drugs Act 1971