You could sign on 31st Dec on the condition that, if the AP drops the next day, you pay the lower figure. Dealers seem to allow that from what I’ve seen.
Current: MY24 Renault Austral Iconic FHD.
Ordered 5/2/26: Chery Tiggo 8 'Summit' ICE
Previous Motability cars:
2013 Ford Focus estate auto.
2016 Vauxhal Zafira 1.4T SE Auto.
2019 Ford Kuga Vignale 1.5 auto AWD. (Ext lease)