private plates advice needed

it won't say on the V5 that the car is on a personal plate

I've just removed a private plate from a car I bought new. The private plate has gone on a retention certificate and the car has gone back to a reg that was originally issued. If the car didn't have an original number such as an import etc, then dvla issue one according to age/year

It's so easy online these days. Yesterday, I removed my private reg off my 530d, which took 2 minutes and cost £80 to put it on retention. I got an email straight away with a 'certificate of retention number'. I needed this to instantly transfer the same reg plate onto my Nissan Maxima, and hey presto, in another 2 minutes it was done. Went outside, and physically swapped the private plate onto the Maxima, and the original plates that came with the 530d (it was given the same number back from DVLA, and I'd kept those plates in the boot) back onto that one. All in, no more than 10 minutes. Beats waiting for days to get the certificates in the post.