UK constitutional anomaly
Source (Wikipedia): West Lothian question

The West Lothian question, also known as the English question, is a political issue in the United Kingdom. It concerns the question of whether members of Parliament (MPs) from Northern Ireland, Scotland and Wales who sit in the House of Commons should be able to vote on matters that affect only England, while neither they nor MPs from England are able to vote on matters that have been devolved to the Northern Ireland Assembly, the Scottish Parliament and the Senedd. The term West Lothian question was coined by Enoch Powell MP in 1977 after Tam Dalyell, the Labour MP for the Scottish constituency of West Lothian, raised the matter repeatedly in House of Commons debates on devolution.