I had part of my D4 returned last Friday (10/03/23) because the Doctor had put a tick in an incorrect box.
I received an explanatory letter that had a reference number on it and a photocopy of just the page that contained the error.
The instructions on the letter said that I should get the Doctor to correct the error and that I had a fortnight to get it done.
Anyway, it’s done now and already winging its way back to DVLA by recorded delivery as I write this.
I’ll update this as and when…