F or example, the address will not be recognised by the Royal Mail, delivery companies or utility services.
Er enghraifft, ni fydd y Post Brenhinol, cwmnïau cludo na gwasanaethau cyfleustodau’n cydnabod y cyfeiriad; a gallai hyn arwain at anawsterau o ran cofrestru i bleidleisio a chael cardiau credyd.