I have just received an email from The Motor Ombudsman "We've now completed our review and we've confirmed that this is something we're able to investigate further.
Your case is waiting to be allocated to one of our case administrators. When your case is picked up, we'll get in touch to introduce you to your case administrator and let you know the next steps."
I've replied noting that multiple owners are in the same boat so they may want to group all the cases together for action. Would be good if others who want rectification raise their own cases at
https://www.themotorombudsman.org
No indication of lead time, but their website suggests it won't be quick. Hopefully Trading Standards will pick it up soon as they may be able to do some arm twisting.