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dan
Very expensive for what they are: disposable masks. The 3m-9925 has p2 protection and a carbon filter and comes in at £40 for a pack of ten. Obviously, it doesn't look as cool as the Cambridge ones. http://www.respiratorshop.co.uk/3m-9925-ffp2-valved-welding-fume-respirator-10-box.html
I also don't see any ISO standard certification on the Cambridge mask site. 3M and the other industrial suppliers have years of experience making and testing these things. There are often real and immediate consequences for their customers if they fail.