In the UK, getting a medical cannabis prescription starts with a specialist...

https://louisvpqz495.theglensecret.com/is-the-prescription-route-different-if-the-product-is-licensed-vs-unlicensed

In the UK, getting a medical cannabis prescription starts with a specialist assessment at a private clinic or, very rarely, through the NHS. If approved, your medication is supplied by a regulated pharmacy to ensure safety and quality