They said on their website they’d changed that requirement.
As for order number there must be a way of doing it because my dealer amended mine early January and it still has the same order number and order date from December only difference being the lower AP by £400.
I’m wondering if there’s a certain change that updates the order and changes ap that some dealers know about and others don’t as some dealers are saying if you change the ap MB will freeze your order and investigate you. Others like mine did it without asking and I checked all the paperwork at the time and my paperwork and online account still says December.
Really weird.
Found it for you no more 12 month min
https://www.motability.co.uk/get-support/faqs/my-allowance-ends-before-my-lease/