On 18 May 2020, the Office for National Statistics stated that they have identified some processing errors affecting the 2018-based national population projections.
Ar 18 Mai 2020, nododd Swyddfa Ystadegau Gwladol eu bod wedi darganfod rhai gwallau prosesu sy'n effeithio ar yr amcanestyniadau poblogaeth genedlaethol ar sail 2018.