Hi guys. I've been isolating pretty well pre seeing family at Xmas. Now thinking about risk I've been exposed to from either walking through communal stairs wearing mask (nobody else does, thankfully I've not met anyone recently), or air circulating from there into my flat. Eg the other day I could smell somebody's perfume in my hall. Any thoughts on this risk? Seems low and I'm sure many have taken more but that's no consolation if your mum dies.