Legal since Nov 2018, medical cannabis is for those who have exhausted standard...

https://finnfazr460.theburnward.com/can-i-qualify-for-medical-cannabis-for-spasticity-in-ms-if-physio-didn-t-help

Legal since Nov 2018, medical cannabis is for those who have exhausted standard treatment options. You need a specialist consultant, not a GP, to prescribe it