Just to finish off Harry
It would appear that once the mot and good condition are done at the same time,as soon as they know the new car has arrived for you they have a special website where dealers can buy or bid to purchase for stock, so can be sold by the time you go to dealer for handover and is picked up by the other dealer in the next day or so,so good condition is needed,i always make sure my car is nice and clean before MOT cant do any harm.