Sorry does this mean I could call one of these garages and move my order ?
Yes, if the dealer carrying stock is willing to do a Motability sale on the car they stock.
Dont get your hopes up straight away mind. My experience recently of chasing after cars “allegedly” showing as in stock on Autotrader has not been great. Often they say they are in stock yet they are not, they are in transit and could be weeks or more away from being delivered to the dealership.
Look at a few adverts and find a few cars that suit you and check that the photos are of the actual car and not just generic photos and then phone the dealer to confirm. If you do find one it’s pretty straightforward so long as they agree for it to go to Motability.