Medical cannabis has been legal in the UK since 2018, but only via specialists...

https://smoothdecorator.com/why-do-people-say-there-is-no-fixed-list-for-medical-cannabis-uk/

Medical cannabis has been legal in the UK since 2018, but only via specialists and usually after other treatments fail. While NHS access exists, it’s rarely granted, leading most patients to explore private specialist pathways instead.