Plenty primers over in Durham area if you’d like to travel. BH Firearms chap was very helpful regarding viht powders and primers.
RWS large rifle and federal small rifle were in stock, also n140/150 so got a lot to keep me going.
it’s worth checking the local rfds rather than just relying solely on the big shops.
Had a long trip to Forrest lodge guns last year to get primers from Teesside area but if need s must that’s what has to be done.
good luck