This is the order I did it in:
Go for a drive ( On private road of course)
Vin number, (Made it up)
Go for another drive
Book SVA. ( Now IVA)
Insurance on vin plate
Go for test drive before SVA.
Pass SVA, Second attempt.
Get DVLA inspection.
Get Road tax
Get Plates made.
Go for long drive...
Sorted ....
