Much of this legislation was developed before devolution, and also before tribunals were recognised as involving exercise of the judicial function of the state, rather than the executive function.
Datblygwyd llawer o'r ddeddfwriaeth hon cyn datganoli, a hefyd cyn cydnabod bod tribiwnlysoedd yn arfer swyddogaeth farnwrol y wladwriaeth, yn hytrach na swyddogaeth weithredol.