Both the 1979 Act and the 1990 Act were enacted before devolution, so they are increasingly out of step with current administrative and governmental structures.
Cafodd Deddf 1979 a Deddf 1990 eu deddfu cyn datganoli, felly maent yn gynyddol anghyson â'r strwythurau gweinyddol a llywodraethol presennol.