Ok, following a conversation with someone at St Georges, re asbestos and face masks, respirators etc, here's some facts-
asbestos is found in a great deal of building materials up until at least the mid '80s
it is found in things as innocuous as artex (amongst many others, of which people think lagging and roofing sheets are the main concern)
asbestos is airborne
asbestos is a natural substance
asbestos causes cancer (asbestosis) and kills, maybe not now, but later on...
I've done an asbestos awareness course and the reality is pretty grim, to be quite honest. I didn't realise just how many products included asbestos, thinking it was just roof sheets and lagging, wrong! many building products included it and probably one of the worst culprits we'll come across is artex...
The UK proceedure is basically wetting down as walls etc are scraped (supposedly lessening the asbestos that is airborne when it is disturbed), whilst fully dressed in disposable overalls, head to toe covered and with a respirator. Following a bout of asbestos removal, a decontamination proceedure (not dis-similar to that akin to radiation) is adhered to, ie moving into a safe sterile area, ppe removed, a shower etc etc as illustrated here, in this US video-
More info can be gleaned from the BBC 'inside out' video here-
so to sum up, I'd question the usefulness of wearing a mask alone, myself....