Ok, so I bought another number to put on the car. Certificate came today, I rang Swansea to ask if I could take my current cnp off and put on retention and put the new one straight on, I was told to take it off and wait for the log book before putting new one on. I said I would have to call my insurance twice to change numbers, once to the vehicles original number, and again to put new number on. She said, no just leave your current reg on and the log book should be there within 3-5 days and to do it then. Does that sound right?