Unfortunately you’ll have to pay the price when you ordered. Your dealer “might” change it to the new lower price. Motability don’t offer a price guarantee anymore and it’s against their terms. If your dealer won’t change it then it’s a case of cancel and order at newer lower price and either wait for new one to be delivered or dealer “might” allow you the one that’s been delivered.
I like sitting outside RAF bases all day pretending to be a photogramapher