The answer to the West Lothian Question is, you’ve guessed it, regional assemblies for England.
According to Professor Robert Hazell, Professor of Government and the Constitution at University College, London, “English votes for English laws” at Westminster seemed logical and fair, but there could be "huge technical difficulties in identifying what counted as an English law". According to the Professor, another solution would involve handing powers to elected regional assemblies, which though overwhelmingly rejected by voters in the North-East, “should not be written-off forever.”
The BBC reports that whilst Professor Hazell agrees that the “closest to a complete answer” would be a separate English Parliament, he notes that there are not any mainstream politicians in favour of such an idea and considers there is no significant public support for it.
I shall leave aside any argument about whether there are any really insurmountable difficulties in practice about the implementation of the Conservatives’ preferred option of “English votes for English laws”1. I am able to predict with absolute certainty that if there is any fudge of this issue, for instance by way of a continuance of the denial that there is any real democratic deficit as between England and those parts of the United Kingdom that enjoy devolved government (the view of the Labour Government) or the imposition of regional assemblies (the current preference of the Labour Government) there will arise an irresistible, overwhelming support for an English Parliament.
Scotland 'still has too many MPs'
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1 I cannot see any great difficulties and would be pleased to hear of examples as to what they might be.