In 2018, the UK amended the Misuse of Drugs Regulations 2001—not the Misuse of...

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

In 2018, the UK amended the Misuse of Drugs Regulations 2001—not the Misuse of Drugs Act 1971—to allow specialist doctors to prescribe cannabis-based medicines classified as Schedule 2 drugs