sultana they can't be bothered by it, or they wouldn't do it. For example, I LOATHE people dawdling along platforms, particularly in pairs/groups - I have to get all the way down the Central Line platform at my stop to have a chance of getting on the train and to be near enough to the exit to make my change in under 10 mins (at Bank - platform there is horrific, you need to be by the exit). Hence, I either look over my shoulder to my 'blind spot' when walking so that I can move if needed (if I need to walk slowly), or walk right by the wall, so that I take up the least possible space. I do the same on the stairs - I'm slow these days, but I keep right over to the edge and tuck my bag out of the way so others can pass.
I'm one of those awful people though, who thinks that if they say things to the 'offenders' often enough, that eventually word will get round/the momentum will change the tide of downright stupidity. E.g. today - walking past Argos, not right next to the wall/steps down, but clearly walking past, purposefully - and a chap wanders down the steps, into my path (he saw me, as he looked at me directly, I saw him clock the bump), and stops dead, and checks his phone. So, because I am awful, I stopped dead too, instead of steering around him, waited until he looked at me, and said 'SERIOUSLY?' in a most aggrieved tone, before walking off. I know that's not actually going to help, but it makes me feel better. As I said - because I'm horrid. 