The review started in Autumn 2017 and was due to report in January 2018 with the new levels becoming available from April 2018.
Dechreuodd yr adolygiad yn yr hydref 2017, gyda'r bwriad o gyflwyno adroddiad ym mis Ionawr 2018, a darparu'r lefelau newydd o gyllid o fis Ebrill 2018 ymlaen.