On Thu, 14 Mar 2013 23:34:13 +0000, ARW wrote:

Then contact http://www.dvlni.gov.uk in the first instance.

Will do.

As somebody else has pointed out, it may well be a Nor'n Iron plate on a
UK car - so just run it past http://www.vehiclelicence.gov.uk first to
see if it's UK-reg or NI-reg. I've just run an Ulster mate's genuine,
current Nor'n Iron plate through, and it comes back not known. But if
that plate's been transferred to Swansea, it'll come back with the
details.