UK cannabis law changed in 2018 with an update to the Misuse of Drugs...
https://www.inter-bookmarks.win/uk-cannabis-law-changed-in-2018-through-the-misuse-of-drugs-regulations-2001
UK cannabis law changed in 2018 with an update to the Misuse of Drugs Regulations 2001, not the older 1971 Act. This allowed specialist doctors to prescribe cannabis-based medicines listed under Schedule 2