The Boots masks do carry what appears to be European and US certification numbers. Not sure where that places them on the scale of usefulness, probably better than nothing.
I do have a decent pair of quite tight fitting goggles. These are not medical, I use them for some diy tasks, and to keep debris out of my eyes when using the garden strimmer, leaf blower etc. I’d look like an idiot, but would probably be willing to wear them too, if I’m forced to engage in uncomfortable activities, like cramped public transport.