The beginning of the National Bat Monitoring Programme Annual Report (Bat Conservation Trust) has information on the quality, methodology and survey design.
Ceir gwybodaeth am ansawdd, methodoleg a dyluniad yr arolwg ar ddechrau Adroddiad Blynyddol y Rhaglen Monitro Ystlumod Genedlaethol (Ymddiriedolaeth Cadwraeth Ystlumod).