Prefix style numberplates

Prefix number plates have a starting letter which indicates the year of issue- A is 1984 for example. FULL LISTING OF PREFIX REGISTRATION DATES

There are then 3 random numbers and three random letters. I Q and Z are not available as letters for this style of number plate. I,Q and Z EXPLAINED

Whereas a Current style plate is fixed to seven digits, this plate can be 5-7 digits- for example:
A1ABC / A12ABC / A123ABC