Oh dear. I always thought British motorists were reasonable at changing lanes away from a hazard (at least that is my memory from the 1980's).
It's one of my pet peeves; I can not understand how anyone* travelling on a multi-lane highway paying reasonable attention should not move over or have an intent to move over to a lane to be away from a visible hazard (i.e. broken down vehicle, obstacle, person, etc, etc, etc). It drives me insane, such a ridiculously easy safety issue to do. I've sadly moved over from a broken down vehicle to look in my mirror to see a stream of traffic nonchalantly sticking rigidly to the lane and flashing by. A couple of years ago the principal's father at the school my kids go to was hit and killed when his vehicle broke down and he pulled over -it may have been so easily avoided. Interestingly there was the introduction of a new law in the state of Massachusetts that said you had to pull a lane over from a stopped police/emergency vehicle which seems to have had some effect (I have seen people pull into the lane over from a police car, but sadly doesn't seem to had the same effect for any other type of vehicle stopped, oh well.)
So yes, no way would I change a tyre on a motorway, either side of the vehicle. Not worth it -I'd call breakdown services. I've taught my daughter to drive over here and have drummed into her head that you should move away from any hazard.
*well, if they don't, they are either: inattentive (comforting, eh?), incompetent (not much comfort from that?), lazy ('nuff said), stupid (goes without saying), comatose with cruise control on (?), drunk, or passed away at the steering wheel. Pick any of these -doesn't matter as far as I'm concerned, they shouldn't be on the road!