Since cannabis was rescheduled in 2018, NHS prescribing is technically allowed...

https://wiki-club.win/index.php/How_Can_I_Spot_Overconfident_Medical_Cannabis_Marketing_in_the_UK%3F

Since cannabis was rescheduled in 2018, NHS prescribing is technically allowed but remains rare, limited to specialist doctors and only for a few conditions—like nabilone for nausea, MS spasticity spray trials