Since 2018, UK cannabis law has changed under the Misuse of Drugs Regulations...

https://post-wiki.win/index.php/Can_Tourists_Bring_Medical_Cannabis_into_the_UK%3F

Since 2018, UK cannabis law has changed under the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. Specialist doctors can now prescribe some cannabis-based medicines, like Sativex and Epidyolex, which are licensed for medical use