In the UK the licence plate is:-
Two letters which says the area where it was first registered - not very clear like Germany and Slovakia are. For instance, Oxford can be OV, OX or OY.
This is followed by two numbers indicating the registration period of six months - March to August are the actual year, Sepyember to February add 5o to the year (or previous year in the case of January or February.
Examples:-
08 = March 2008 to August 2008
58 = September 2008 to February 2009
09= March 2009 to August 2009
59 = September 2009 to February 2010
10 = March 2010 to August 2010
60 = September 2010 to February 2011
11 = March 2011 to August 2011
61 = September 2011 to February 2012
etc...........
This is then followed by three random letters.
So:- 0Y 58 ABC -s a car first registered in Oxford between September 2008 and February 2009.
You *can* buy specials to make a word, but these can get very expensive.
I rather wanted MU51CAL, but they don't do a U, only V as they can get confused.
This new system started in September 2001.
Before that it was three letters followed by three numbers followed by a letter that denoted the above six month period.
The last was Y which was March to August 2001.
Before that started, it was the other way round - A 123 ABC started in January 1963 - originally it was for a full year startng in January, but got changed to the six months as I described earlier a few years later, I forget when.
The first two of the three letters are the area of first registration - but they are so obscure, most people don't know them.
Before this it was up to three letters and three numbers (or vice versa) - the very first registered car was A 1.
I hope this helps.