Personalised Number Plate Information

By 1932, the available numbers within this scheme were running out, and an extended scheme was introduced. This scheme consisted of three letters and up to three digits, taken from the series AAA 1 to YYY 999. The letters I, Q, and Z were never used, as they were considered too easy to mistake for other letters or numbers or were reserved for special use, such as the use of I and Z for Irish registrations and Q for temporary imports. (After independence, the Republic of Ireland continued to use this scheme until 1986, and Northern Ireland still uses it.)

Since the dvla introduced the bsau145d legislation it has been increasingly difficult for motorists to obtain number plates with anything other than legal spacing.

There is however another line of argument for the defence of the serial mis spacer. They say that a number plate that has been altered to make a word or a name is much more memorable in the event of an incident.
They also argue that the dvla blatantly auction registration numbers that would be virtually worthless without mis spacing.

Diplomatic Plates 'D' what are they?

Diplomatic plates

Since 1979 cars operated by foreign embassies, high commissions, consular staff, and various international organisations have been given plates with a distinguishing format of three numbers, one letter, three numbers. The letter is D for diplomats or X for accredited non-diplomatic staff. The first group of three numbers identifies the country or organisation to whom the plate has been issued, the second group of three numbers is a serial number, starting at 101 for diplomats (although some embassies were erroneously issued 100), 400 for non-diplomatic staff of international organisations, and 700 for consular staff. Thus, for example, 101 D 101 identifies the first plate allocated to the Afghanistan embassy, 900 X 400 is the first plate allocated to the Commonwealth Secretariat.