I read that and it seems that they have tried to make things simple but it has become complicated.
The U.K. numbering systems certainly seem to have some drawbacks.
The year-letter system (suffix from 1963 - 1983, prefix from 1983 - 2001) probably seemed like a good idea when it was introduced, but with the huge increase in the number of cars on the road since the sixties it became rather wasteful of numbers.
For example, you could have had an area start issuing numbers from
K1 AST in August 1992, then when they reached
K999 AST they'd issue
K1 BST through to
K999 BST, then
K1 CST through
K999 CST, and so on. But if by July 1992 they only gotten as far as, say,
K721 PST, then all the remaining numbers in that series from
K722 PST through
K999 YST were effectively wasted because from August 1993 they'd start a new series from
L1 AST.
That didn't happen prior to the year-letter system, because the local councils (which handled registrations at that time) would simply carry on with the next number in sequence until they ran out, then get a new code assigned for their area when necessary.
While the new format from 2001 makes an attempt to show the approximate registration area in a more memorable way, I have to wonder why it was even considered necessary to maintain this method of identification. Assigning letter codes to districts made sense in a pre-computer age when registrations were handled locally, but with everything now on a centralized DVLA database, I don't see that it serves a useful purpose any longer. Remember that U.K. cars don't get a new number when moving to another district, so that code shows only where it was registered originally, not necessarily where it is based now.
The same goes for continuing with the age identifiers. Why do we need the car's year identified on the plate anyway? It's not as if it can't be determined in other ways. Besides, with personalized registrations and what DVLA calls "cherished transfers" (where you can have the number from your old car transferred to your new car), it isn't an automatic indication of age in all cases anyway.
The other thing which makes the U.K. system subject to having to come up with ever-more convoluted formats every so often is the basic rule that once a number has been issued it can never be re-used, except in a few very restricted situations. Think of the thousands of numbers in the
AB 1234,
ABC 123, and
ABC 123A formats which have been dormant for decades.