Sent off my first letter last week, including an extra bit asking why it took them two months to send me the notification in the first place. Got a lovely letter back from the appeals department telling me:
even though, as stated earlier in the thread, it is the Driver and not the Keeper... and no mention about the delay either.
So I ignored the letter and got the FINAL REMINDER today giving me two weeks to pay the increased amount. Time for the second letter I think, and see if they can tell me about the two month delay.