Ymyrrodd y Prif Weinidog yn yr apêl yn y Goruchaf Lys. Gwnaeth hynny er mwyn cyflwyno sylwadau ar herio Deddfau’r Cynulliad ar seiliau yn y gyfraith gyffredin. Ymddangosais gerbron y Goruchaf Lys i gyflwyno sylwadau llafar ar ran Llywodraeth Cymru mewn gwrandawiad rhwng 13, 14 a 15 Mehefin 2011.
The First Minister intervened in the appeal in the Supreme Court in order to make representations on the scope of common law challenge so far as Acts of the Assembly were concerned. I appeared before the Supreme Court to make oral representations on behalf of the Welsh Government at the hearing which took place over 13th, 14th and 15th June 2011.