Mae Adran Actiwari’r Llywodraeth (GAD) yn gyfrifol am wneud hyn mewn perthynas â’r mwyafrif o gynlluniau pensiwn y sector cyhoeddus. Rhwng 2001 a 2006, ni ddiwygiodd GAD y ffactorau cymudo ar gyfer cynlluniau pensiwn tân a’r heddlu, er bod rhesymau cadarn paham y dylent fod wedi gwneud hynny, megis newidiadau mewn disgwyliad oes ar gyfartaledd.
The Government Actuary’s Department (GAD) is responsible for doing this as regards most public-sector pension schemes.  Between 2001 and 2006, GAD did not revise the commutation factors for the fire and police pension schemes, although there were sound reasons why they should have done, such as changes in average life expectancy.