Imported second hand cars can be built in say 1990 and if imported in 2008 get an 08 plate.
Alan
Only if they are declared new at registration. Some supporting evidence that they are new would be required (probably an inspection by VOSA, especially if its A.N.Other declaring it new rather than Vauxhall Motors).
If no evidence of "newness" is available it will get an age related plate with the year of manufacutre, and if there is no supporting evidence of its' year of manufacture it will get a Q plate.
Of course, the manufacturer can leave cars in a field for as long as they like before declaring them "new".
Having said that, VROs all seem to apply different rules and the whole organisation is just a nightmare. It wouldn't surprise me if someone just pushed the wrong buttons in this case.
Kevin