After mailing TTS Enquiries I got a response back from Martin, which said:

Thank you for your enquiry. Because it is a registration matter, this is for the DVLA and not us. We cover technical engineering matters only. if you call 01792 766 xxx you should reach a real person at the DVLA.

The number above went through to a Gareth's voicemail, so I've left a voicemail.  Hopefully Gareth will call me back in due course, to discuss this sticky subject.

Can't wait.

Not had the documents back for the Corrado.  No doubt they're bouncing from desk to desk at the moment, looking for an official line to cling to.