Mae'r cais yn enw Cwnsler Cyffredinol Cymru, sydd wedi'i benodi gan Ei Mawrhydi ac sy'n aelod o Lywodraeth Cymru (gweler adran 49 o Ddeddf Llywodraeth Cymru 2006 ("Deddf 2006")).Mae o'r farn bod yr apêl hon yn codi materion cyfansoddiadol pwysig tu hwnt ynghylch y fframwaith cyfreithiol ar gyfer datganoli yng Nghymru a'r Deyrnas Unedig, ac fe fydd yn dadlau y dylai dyfarniad y Llys Adrannol sefyll. Anfonodd y Cwnsler Cyffredinol gwnsleriaid iau ac arweiniol i'r tridiau o wrandawiad gerbron y Llys Adrannol ar friff gwylio swyddogol. Fe gafodd eu presenoldeb ei gydnabod gan y Llys ym mharagraff 7 y dyfarniad. Ymddangosodd prif gwnsler Llywodraeth yr Alban gerbron y Llys Adrannol yn yr un modd.
The applicant is the Counsel General for Wales, who is appointed by Her Majesty and is a member of the Welsh Government (see section 49 of the Government of Wales Act 2006 (“GoWA 2006")).  He considers that this appeal raises extremely important constitutional issues regarding the legal framework for devolution in Wales and the United Kingdom and will argue that the judgment of the Divisional Court should be upheld. The Counsel General instructed leading and junior counsel to attend the three-day hearing before the Divisional Court on an official watching brief. The Court acknowledged their presence in paragraph 7 of its judgment. Leading counsel for the Scottish Government also appeared before the Divisional Court in the same capacity.