I've ordered private registration number for my M3 which I have retention documents for. I am due to pick up this Friday and I have been given the original registration from Tesla. I have contacted Tesla to ask them to make my private registration plates for me which I know is available at Heathrow service centre, where I will be going. My question is what registration number should I use for the insurance on collection? If I use their original registration and they manage to produce my private plates for me in time for me to drive home in them, then the registration on my insurance papers will be wrong. Same goes if I use the private number on my insurance and they cannot make the plates on time for me to use to drive home. Also, do I have to have the car's assigned number on the insurance in order to collect? Any advice?