to respond to decisions of the courts/tribunals which affect or may affect the Welsh Tax Acts, or regulations made under them.
i ymateb i newidiadau a wneir i drethi ‘rhagflaenol’ y DU (hynny yw, treth dir y dreth stamp neu'r dreth dirlenwi) sy'n effeithio, neu a allai effeithio, ar y swm a delir i Gronfa Gyfunol Cymru, ac