The current contract to deliver the National Survey, held by Office for National Statistics, comes to an end with the end of 2022-23 fieldwork in March 2023.
Mae'r contract presennol i gynnal yr Arolwg Cenedlaethol, a ddelir gan y Swyddfa Ystadegau Gwladol, yn dod i ben â'r gwaith maes diwedd 2022-23 ym mis Mawrth 2023.