Since the 2018 law change, medical cannabis is legal in the UK via specialist...

https://wiki-triod.win/index.php/Medical_Cannabis_for_Migraines_in_the_UK:_What_to_Expect

Since the 2018 law change, medical cannabis is legal in the UK via specialist prescription. Many ask about eligibility, consult costs, and the process. While NHS access remains limited, private clinics offer another path. Here is the reality today.