You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Scottish_Parliament

Context:
A procedural consequence of the establishment of the Scottish Parliament is that Scottish MPs sitting in the UK House of Commons are able to vote on domestic legislation that applies only to England, Wales and Northern Ireland – whilst English, Scottish, Welsh and Northern Irish Westminster MPs are unable to vote on the domestic legislation of the Scottish Parliament. This phenomenon is known as the West Lothian question and has led to criticism. Following the Conservative victory in the 2015 UK election, standing orders of the House of Commons were changed to give MPs representing English constituencies a new "veto" over laws only affecting England.

Question:
What phenomenon has led to criticism?

West Lothian question