] Scotland, Wales and Northern Ireland each have their own devolved government or executive , led by a First Minister (or, in the case of Northern Ireland, a diarchal First Minister and deputy First Minister ), and a devolved unicameral legislature. England, the largest country of the United Kingdom, has no such devolved executive or legislature and is administered and legislated for directly by the UK government and parliament on all issues. This situation has given rise to the so-called West Lothian question which concerns the fact that MPs from Scotland, Wales and Northern Ireland can vote, sometimes decisively, [ 156 ] on matters that only affect England. [ 157 ] The McKay Commission reported on this matter in March 2013 recommending that laws affecting only England should need support from a majority of English MPs. [ 158 ] The UK does not have a codified constitution and constitutional matters are not among the powers devolved to Scotland, Wales or Northern Ireland. Under the doctrine of parliamentary sovereignty , the UK Parliament could, in theory, therefore, abolish the Scottish Parliament, Welsh Assembly or Northern Ireland Assembly. [ 165 ] [ 166 ] Indeed, in 1972, the UK Parliament unilaterally prorogued the Parliament of Northern Ireland , setting a precedent relevant to contemporary devolved institutions. [ 167 ] In practice, it would be politically difficult for the UK Parliament to abolish devolution to the Scottish Parliament and the Welsh Assembly, given the political entrenchment created by referendum decisions. [ 168 ]