These can be found on the reverse of a photocard driving licence (under category 12, information codes) and in the ‘codes’ sections on the front of the counterpart driving licence.
Ceir hyd i'r rhain ar gefn y drwydded yrru cerdyn-llun (o dan gategori 12, codau gwybodaeth) ac yn yr adran 'codau' ar flaen yr wrthddalen bapur.