Intergovernmental concordats, memorandums and other agreements between UK government, Welsh Government, Scottish Government and Northern Ireland Executive.
Concordatau a memoranda rhynglywodraethol a chytundebau eraill rhwng Llywodraeth y DU, Llywodraeth Cymru, Llywodraeth yr Alban a Gweithrediaeth Gogledd Iwerddon.