Medical cannabis has been legally available in the UK since 2018 for patients...

https://victor-wiki.win/index.php/Can_I_Upload_My_Medical_Records_to_a_Cannabis_Clinic_Securely%3F

Medical cannabis has been legally available in the UK since 2018 for patients when other options haven’t worked. It isn’t a simple purchase; access requires an assessment by a specialist doctor at a regulated clinic