This will require joint work between the governments of the UK at official level with a clear process for agreement at ministerial level and process for dispute resolution if required.
Bydd hyn yn gofyn am waith ar y cyd rhwng llywodraethau’r DU ar lefel swyddogion gyda phroses glir i ddod i gytundeb ar lefel weinidogol a phroses i ddatrys anghydfodau os oes angen.