How many?
Well, if I own up to the number, then tell you what I was trying to do, you might not laugh so scornfully...? FOUR - yes 4!!
I did it one month early, then lost the papers... then forgot to take the reminder with me, then messed up the V10 so it had to be done twice. The lady behind the counter recognised the original cheque and laughed, then finally - after all the refilling of forms asked me to go away - very politely. She was lovely, but really I should be able to tax my car by now without all this trauma. Shouldn't I???