Medical cannabis became legal in the UK in 2018, but it remains a last-resort...

https://wiki-quicky.win/index.php/Can_You_Get_Medical_Cannabis_for_Depression_in_the_UK%3F_A_Realistic_Guide

Medical cannabis became legal in the UK in 2018, but it remains a last-resort option. You need a prescription from a specialist, not a GP, and usually evidence that other treatments have failed to help