Article on The Internet Mini Encyclopædia
Registration letters used in UK
Here is a list of the registration--letters as used on UK-registration plates and the years they were issued:
O,Z and I are avoided as these look too much like nos. U is avoided because it looks like V. Q was originally avoided as it looked like a number, but since 84 has been used to denote a car which was ex-military, imported, rebodied or otherwise not all-new, or built from a kit of parts, some of which were not new at time of first register.
All cars up to postfix K can legally display a "Vintage" rear no. plate (ie silver letters on black). All others have to display the black letters on reflective yellow plate.
The numbering system changed to a new format (AB12 XYZ) - see the DFT's website for more details
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