During 2022-23, the survey is likely to be carried out by phone, possibly with an online section; but we will make a final decision by end 2021 on whether to return to face-to-face.
Mae'r canlyniadau hyn yn cwmpasu'r cyfnod rhwng mis Hydref 2022 a Medi 2023, felly mae’r holl gyfweliadau yn rhai dros y ffôn.