Many previous threads on this Toby.
Speak to your dealer, and as above ask him to cancel and re-order your car on the Motability system at the lower AP. It’s a 5 minute administrative job and doesn’t affect your order with the dealer or manufacturer.
Some dealers do this without asking, some do it willingly upon asking, some do it reluctantly and others refuse outright. They are under no obligation to put it through at the reduced price.
But it’s definitely worth asking in a friendly way
Good luck and let us know how you get on.
2024 - BMW i4 Grand Coupe eDrive 35 Sport
2020 - Volvo XC40 T4 Inscription
2017 - Audi Q3 TFSi Sport S-Tronic