Dear Chills,
You need to contact Motability Operations. As the vehicle is on hire purchase it may be possible if the monthly payments are still affordable, to come to alternative arrangements.
Motability have s specialist Resolutions Team to assist in these situation.
You need to contact them using Motability's normal 'phone number 0845 456 4566, and a member of their Resolutions Team who are London based will phone you.
Good luck.
Pat
PS. All our Motabilty cars have been on lease, and I seem to remember that Motability will allow their cars to be retained pending an appeal, but not sure if this applies to their HP scheme.