It began on 24 April 2020, after face-to-face National Survey fieldwork was halted on 16 March 2020 due to the coronavirus outbreak.
Dechreuodd yr arolwg ar 24 Ebrill 2020, wedi i waith maes wyneb yn wyneb yr Arolwg Cenedlaethol gael ei atal ar 16 Mawrth 2020 oherwydd haint y coronafeirws.