Medical cannabis has been legal in the UK since November 2018 for specific...

https://andreimgc701.cavandoragh.org/what-information-do-i-need-for-a-medical-cannabis-assessment-uk

Medical cannabis has been legal in the UK since November 2018 for specific conditions, but it is not a first-line treatment. You require a prescription from a specialist doctor, typically after other licensed options have failed to help