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

https://claytonnujn348.timeforchangecounselling.com/what-international-treaties-affect-uk-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