I believe that once an order is placed, the dealerships and manufacturers can do what they like, at least that’s the impression I’ve been given.
Last August I ordered an Astra Sports Tourer that eventually took nine months to arrive and not the three promised. During that time, a number of what I felt to be key items had been downgraded from the model displayed in the showroom. The car even turning up with no parking sensors. These were added a few weeks later but were poor in comparison the factory fitted ones.
After complaining to both the Vauxhall and the dealership and basically getting nowhere I called Motability who kindly offered to let me return the car early and were really helpful. I’ve now changed manufacturers and the whole process has gone someway to helping restore my trust in dealerships.