from the official post office website
First, you’ll need one of the following:
Your V11
Your V85/1 if it’s a Heavy Good Vehicle (HGV)
Your V5C logbook
Your V5C/2 if you’ve just bought the vehicle
Bring one of these to your local Post Office branch. To find a local branch that can sort out vehicle tax, use our Branch Finder.
If you don’t have any of these, then you need to apply for a fresh V5C. You need to fill out a V62 form, which you can pick up from Post Office branches. The cost is £25.
What else you’ll need
A valid MOT – it has to be valid from the date your vehicle tax starts or the date your vehicle tax is issued, whichever is later
A valid Exemption Certificate – if you claim disabled vehicle tax
A valid Reduced Pollution Certificate – if your vehicle has been modified for reduced pollution
A valid GVT or PSVC – if you need either of these, it’ll be mentioned on your vehicle tax reminder
If you’re in Northern Ireland, you’ll need to have a valid paper copy of either your certificate of insurance or a cover note. Your insurance needs to be valid from the date your vehicle tax starts or the date your vehicle tax is issued – whichever is later.
And here is the government consultation that was passed
https://assets.publishing.service.gov.u ... ummary.pdf