your driving license number is your surname followed by your year of birth,eg 52, in betweent this is the date,eg12, followed byt the month,eg 07. So, if you were born on the 7th of July 1952 , your number would be 512072. Next you add your initials,eg DK. So, if your name was eg Daniel Kevin Bloggs, your number would be,,,BLOGGS512072DK.
Now it gets a bit tricky because there is an issue code added on after this & I havn't got the faintest idia how this works, but to be honest , if you give them your DOB, DVLA will work this out fot you!