It's not all about threatening to tow people's cars away at the DVLA. They do have time for some fun, with the national numberplate registrar regularly adding rude or offensive number and letter combinations to its banned list.
Such possibly offensive random combinations as MU12 DER, PE12 VRT and JE12 KOF have been added to the blacklist, along with potentially inflammatory religious and racial combinations like KO12 ANN and NA12 ZEE.
Gang-related terms like YA12 DEE are also not allowed, along with comedy booze references like DD12 UNK and LE61 ESS. [The Register]