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unissued and no longer used reg no. - Brad
3 things here

Can I buy a number plate that has never been issued? How?

Can I buy the number plate of my dad's first ever car which is long rusted away?

My dad also has a number plate that is attached to a tandem which had a petrol engine (don't laugh - my parent regularly did 100 miles in a day on this). The tandem isn't used any more. can he sell teh number plate which has a memorable number (as it's so old0
unissued and no longer used reg no. - BrianW
IIRC, you can only transfer a number off a vehicle if it has a current MOT.
And the DVLC cancelled and took back all numbers not in use around 1980, so the one at the back of your garage is no longer available for you to transfer.
unissued and no longer used reg no. - Stuartli
The simplest and most accurate way of finding out is to contact the DVLA and make enquiries about particular registration numbers being available for sale:

www.dvla.gov.uk/faq/faq_number_plates.htm

It's a good earner for the Treasury, hence those auctions of cherished registration numbers, but they can start at around £80.

Don't use the firms that sell registration numbers as they only do what you would do (in most cases) and charge you for the privilege.
unissued and no longer used reg no. - No Do$h
Many plates that have not been issued to date are held back for inclusion in "cherished marks" auctions run by the DVLA. I'm awaiting the release of just such a plate.

You can register your interest and they will contact you when they schedule it to be placed in an auction.