Datganiad Ysgrifenedig: Y Papur Gwyn ar Gyfrifiad 2021,  Helpu i Lunio ein Dyfodol: Cyfrifiad o Boblogaeth a Thai yng Nghymru a Lloegr 2021
Written Statement: 2021 Census White Paper, Help Shape Our Future: The 2021 Census of Population and Housing in England and Wales