and if the disabled driver isn’t physically capable of changing the wheel this achieves what exactly?
They are able to call the RAC and have their tyre changed.
Which if it’s one of the skinny kind supplied with most new cars today (if at all) it is only there to allow you to drive to the nearest tyre centre.
So as you know we get the RAC on Motability so where is the logic in having the RAC come out to fit a tyre that they are then going to have to escort you to the nearest tyre centre to immediately have removed again. Quicker for them just to load you up and tow you there without touching the wheel.
A lot of cars nowadays simply aren’t designed with the bootspace for a full size spare tyre but I suppose you could buy yourself one and make sure its secured with an approved fixing kit – last thing you want is a spare tyre thats not designed to be in your boot in the first place flying forward during an impact.