For any queries regarding completion of the survey which aren't answered by this guide see the Introduction section of this guide, or within the survey.
Os oes gennych unrhyw gwestiynau ynghylch cwblhau’r arolwg nad yw’r canllawiau hyn yn eu hateb, darllenwch y Cyflwyniad i’r canllawiau hyn neu yr arolwg ei hun.