Byddai newidiadau mwy arwyddocaol eraill, fel y cap, wedi cael eu gwneud fel arfer trwy OSau yn y Cyfrin Gyngor, o dan y weithdrefn gadarnhaol, a’u gosod yn holl ddeddfwrfeydd y DU yr un pryd, yn unol â Deddf 2008. Fodd bynnag, gan nad oes Gweithrediaeth yng Ngogledd Iwerddon na Chynulliad sy’n eistedd, nid yw'n bosibl gwneud deddfwriaeth ledled y DU drwy'r weithdrefn gadarnhaol.
Other more significant changes, such as the cap, would ordinarily have been made through SIs in the form of Orders in Council, subject to the affirmative procedure, laid in all legislatures of the UK in parallel, pursuant to the 2008 Act. However, due to the absence of a Northern Ireland Executive and sitting Assembly, it is not possible to make UK-wide legislation, through the affirmative procedure.