There is no expiry date for using your permits, but if you haven't used them all within 18 months we will contact you to check that you still need them.
Does dim rhaid ichi ddefnyddio'ch hawlenni cyn dyddiad penodol, ond os fyddwch wedi defnyddio pob un ohonynt ymhen 18 mis, byddwn yn cysylltu â chi i weld os oes dal eu hangen arnoch.