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I've been using disposable FFP2 masks for months. You can use them a lot more than the official usage life as @Stonehedge says but you have to bin them eventually.
I tried lots of pharmacies at the time, no joy, so ordered from Amazon. Honestly at the moment if you go around multiple shops trying to find them with a standard face covering which offers zero protection from contracting the virus you're probably undermining a lot of the benefit of FFP2/3 masks with those interactions! I would be avoiding shops where possible pre-Christmas.
Ok thanks all, going to look for some non-valved FFP2 or N95. Leyland only seem to have non-rated ones now. Screwfix have lots of valved ones but only P1 unvalved. Time to hit the pharmacies I guess. Any recs for reusable ones?