The rules and procedures for the various devolved Welsh tribunals have developed piecemeal from a wide range of different pieces of legislation, making them complicated and inconsistent.
Cafodd nifer bach o OSau cyfraith a gymathwyd a oedd ar wahanol gamau cwblhau a thrafod rhwng llywodraethau eu hatal ar ôl cyhoeddi'r Etholiad Cyffredinol.