Alang gurgled happily, sounding much like they were saying:
Not quite, because he's still making some distinction between VED & SORN.
They're basically two of the three points on one line that any registered vehicle must sit on - with the third being "sit back and wait for the letter telling you where to send the cheque".
By Tony's logic, I can't possibly have had valid tax discs for cars that either no longer exist or are in multiple counties.