.... Couriers have even claimed to have delivered a parcel to the correct address and after 'discussions' with their base we had had a call back to say it is still on the van! ... So power companies wrongly cutting supplies are no surprise to me.
Albeit for somewhat different reasons, we are in a similar position to you, in that (even with a postcode) many people either have difficulties finding our house or, like you, think they have found it when they have found somewhere else. On top of that, a significant proportion of our mail only gets to us (again, despite postcodes) after having had a journey to, and then back from, a village about 30 miles away (in a different county) with name (and some street names) the same as ours - I therefore certainly understand people and companies 'mis-identify' properties at times.
However, that's not quite what we are talking about here. If (as traditionally) an electricity company was disconnecting the supply in a manner which required them to physically find and attend the property, it would be strange, rather irresponsible and possibly even dangerous to do so without making some contact with the occupier of the property whose supply they were about to disconnect (who presumably would 'put them right' if it was the wrong property!).
The concerns being discussed here were that 'Smart' meters afford, at least technologically, a means of 'remote' disconnection which does not require them to go anywhere near the property. However, even if they did that, my understanding is that it would be done on the basis of the MPAN number, not a physical address (but they could obviously get that wrong, too - which is perhaps one reason why companies have said that they won't do remote disconnection)
In any event, as you will have seen, my response to JohnD's comment to which you have also now responded was that, contrary to what he implied, my experience is that government-related organisations (government departments/agencies, nationalised industries) are at least as capable of making mistakes and getting things wrong as are "privatised utilities"!
Kind Regards, John