I suspect that a lot of the failure of minds to meet on the previous page relates to some basic town/country differences.
It is absolutely true that a taxed/MOTd/insured car can be parked on the public highway, for any length of time, anywhere where there is no specific prohibition (disabled space,dropped kerb, yellow lines etc). No-one has any 'rights' to the road outside their house.
When I lived in a busy town street it was the law of the jungle - if you saw a space you took it - the concept of asking anyone if you could do so would be just alien to everyone's thought processes.
In my rural village there is no parking problem at all - plenty of spaces on the roads. So when, for instance, one of my neighbours temporarily had a son and his wife move back in (with an extra two cars) they had a quick word with the rest of us to work out the least intrusive places to park those cars (outside my house as it happened). Not a legal requirement, just a courtesy.
From my hazy memory of a single visit to gness's road (I was on the bike & so parking was less of an issue) most of the houses have extensive double-width dropped kerbs. It would be, I guess, virtually impossible to park a car in some parts of the road without obscuring at least some part of a dropped area - but without in any way actually 'blocking off' access to the property. In that situation I would always just check with the relevant householder that I wasn't impeding their access.
Politeness costs nothing - just because you 'know your rights' doesn't mean that you shouldn't show courtesy to others.