I always have a car from Theo (Arillas Cars), and I had a car two weeks ago and there is no need to get the new "Check Code". As usual he needs details from your driving licence.
AS a backup I now keep a copy of my licence, on line together with my NI number stored at
www.box.com, and as long as I have an internet connection I can get a copy. Also if I did need a check code I can always access the required information. I always upload all information required for a holiday, including passport details, booking details, boarding passes etc