Ym mis Mehefin, fe benderfynodd Ysgrifennydd y Cabinet dros Gyllid a Llywodraeth Leol ar y pryd y dylid cynnal pob un o’r 22 o adolygiadau o ffiniau etholiadol yn ystod y tymor Llywodraeth Leol presennol, hy cyn cynnal yr etholiadau nesaf ym mis Mai 2022, gan roi digon o amser i ystyried y newidiadau a’u hadlewyrchu mewn Gorchmynion. Er mwyn ei gwneud yn bosibl cyflwyno’r newidiadau erbyn etholiadau’r prif gynghorau ym mis Mai 2022, bydd angen sicrhau bod yr adolygiadau wedi eu cwblhau a bod y Gorchmynion mewn grym erbyn diwedd mis Medi 2021, er mwyn i’r awdurdodau gael digon o amser i allu gweithredu’r newidiadau hynny.
In June 2016 the then Cabinet Secretary for Finance and Local Government took the decision that all 22 electoral boundary reviews should take place within the current Local Government term i.e. in advance of the next elections in May 2022 and in sufficient time to enable changes in the electoral boundaries to be taken into account and reflected in Orders. In order to be in place before the principal council elections in May 2022 the reviews need to be completed and Orders in force by the end of September 2021 to provide local authorities with sufficient time to implement the changes.