However, as there was limited funding at a regional level, the union was reluctant to try and test the case and support with legal costs to take the case forward.
Fodd bynnag, gan fod cyllid yn brin ar lefel ranbarthol, roedd yr undeb yn amharod i geisio profi'r achos a chefnogi gyda chostau cyfreithiol i fynd â'r achos ymlaen.