If the pupil has previously been educated in a maintained school in England or Wales, their old UPN should be reassigned to them and the temporary UPN removed.
Os bydd y disgybl wedi ei addysgu'n flaenorol mewn ysgol a gynhelir yng Nghymru neu Loegr, dylid ailddyrannu ei hen RhUD iddo a dileu'r RhUD dros dro.