Having returned my V5c/3 recently for VeeKay, I was surprised to find that I was being asked to pay the tax for this month.
I checked on the Royal Mail web-site and my recorded delivery hasn't yet arrived... first class mail - over a week... but that's a different story.
I phoned up DVLA and bluffed them a bit saying that Royal Mail had the letter signed for by them a few days ago to which I got the answer:-
"That can't be right. We get so many recorded delivery letters that we have a dispensation and we don't have to sign for them. They are delivered in the same way as ordinary mail"
That little bombshell has caused me some considerable concern. Not for my case as I had the whole process witnessed by another Magistrate, but for not realizing that "Signed for" clearly doesn't mean what it says, with all the potential for trouble that raises.