From: "JM" 
Newsgroups: uk.legal uk.finance
Subject: Re: Trivia: Britain's most broken law is?
Date: Wed, 1 Dec 2004 17:45:59 -0000

Fat Sam wrote:
>
> They are allowed to add a coloured border around the outside of the
> plate, and a small graphic at the left hand end of the plate
> (normally a blue block with a flag or something similar in it).....

The graphic at the left hand side can only be the EU ring of stars and the 
letters 'GB':

http://www.dvla.gov.uk/vehicles/regmarks/reg_marks_current_requirements.htm#europlate

"The Government announced on 28 December 2001 the intention to permit the 
display of national flags and national identifiers on vehicle number plates. 
The Road Vehicles (Display of Registration Marks) Regulations 2001 are in 
the process of being amended. They will provide for the voluntary display of 
the Union flag, Scottish Saltire, Cross of St George and Red Dragon. 
Football team crests etc are not allowed."

Implies that national flags aren't yet allowed (but I see plenty about)

John.