"Martin Underwood" wrote in message
...

I know the situation in Yorkshire better than Anglia: at one time UA, UB,
UM
were Leeds, YG was Bradford, CX was Huddersfield and HL was Wakefield.
These
were merged so that all these letters signified "somewhere in West
Yorkshire". I think the size of the region covered was further increased
with the new-style AA05 BBB numberplates. I'm not sure why they even
bothered to use new letters: the A123 BCD format had a two-letter location
code (CD) so why not continue to use the same code in the new-style
numberplates? Methinks that they took the opportunity to rationalise
(merge)
some of the issuing offices at the same time.

The 1966 vehicle registrations letters can be found on my web site, in a
link from http://www.btinternet.com/~terry.harper/gallery.htm at the bottom
of the page. There were earlier lists which used to appear in each year's AA
handbook. Back when H and HX and lots of Mx combinations were Middlesex, for
example.
--
Terry Harper, Web Co-ordinator, The Omnibus Society
75th Anniversary 2004, see http://www.omnibussoc.org/75th.htm
E-mail:
URL: http://www.terry.harper.btinternet.co.uk/