This is reply I got ….. Hi Gary, Thanks for getting in touch, Unfortunately, Motability monitor this now and have said categorically we cannot amend the advance payment once submitted. We would be fined if it was to be known.
What the dealer is saying is technically correct, but most will do it on the quiet. Mine did it without me even asking them to! With such a vast AP I’d speak to another Skoda dealer. If not, as has been said, your only other option if the AP comes down is to tell the dealer that you will cancel and re order. You will probably find that their objection will evaporate at that point!