In 2018, UK cannabis law changed through updates to the Misuse of Drugs...

https://becketteulj000.cavandoragh.org/what-does-marketing-authorisation-mean-for-a-cannabis-medicine-in-the-uk

In 2018, UK cannabis law changed through updates to the Misuse of Drugs Regulations 2001, not the Misuse of Drugs Act 1971. Since then, specialist doctors can prescribe cannabis-based medicines listed as Schedule 2 substances