Update on this:
For practical reasons, I took the replacement offered. I didn’t make a complaint either. However, it meant that my Good Condition Payment (which my initial order made me eligible for) became ineligible because the replacement car went through as a new order (after October 1st). Motability say that they can’t honour the GCP but they’re writing a complaint to the dealer and requesting that they cover the GCP and have advised me to do the same.
Any thoughts on this?