Since 2018, the Misuse of Drugs Regulations 2001—not the 1971 Act—allow...

https://www.tntmagazine.com/leisure-entertainment/leisure/why-is-cannabis-still-illegal-in-the-uk-the-history-behind-medical-cannabis-law/

Since 2018, the Misuse of Drugs Regulations 2001—not the 1971 Act—allow specialist doctors in the UK to prescribe certain cannabis-based medicines, like Sativex and Epidyolex. However, cannabis itself remains a Class B drug, keeping most uses illegal