To prove your address you will need to give permission for the Local Authority to check the Council Tax database, Electoral Register and school Register (under 16).
Er mwyn cadarnhau eich cyfeiriad, bydd angen ichi roi caniatâd i'r Awdurdod Lleol wirio'r cronfa ddata Treth y Cyngor, y Gofrestr Etholiadol a cofrestr yr ysgol (dan 16 oed).