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

https://wiki-book.win/index.php/Which_Conditions_Does_the_NHS_Actually_Fund_Medical_Cannabis_For%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