Meanwhile in England support for a devolved English Parliament seems to be growing. The Westminster politicians are not keen on this option. They would lose all the issues their electors really care about education, health and criminal justice (if the English Parliament had the same powers as the Scottish one). The UK Parliament would be left with foreign affairs, defence and raising the taxes to pay for the schemes of the devolved institutions.

Given that, despite a large degree of devolution of education, health and justice, the Spanish Parliament hasn't lost its pre-eminent position in the mind of Spaniards after 20 to 25 years of devolution, I wonder whether what you are saying is true, and how that would work. Would Westminster lose or share the power to legislate on these areas? Some power to legislate at the national level would be necessary to ensure coordination and cohesion of the regional systems (though the controversy over drugs available under the NHS in Scotland but not in England makes me wonder about this). Wikipedia claims

The Scotland Act 1998 creates the Scottish Parliament, sets out how Members of the Scottish Parliament are to be elected, makes some provision about the internal operation of the Parliament (although many issues are left for the Parliament itself to regulate) and sets out the process for the Parliament to consider and pass Bills which become Acts of the Scottish Parliament once they receive Royal Assent. The Act does not affect the power of the UK Parliament to legislate in respect of Scotland, recognising the concept of Parliamentary sovereignty.

I am beginning to wonder how the Scotland Act 1998 compares with, say, the new Catalan Statute. Comparisons between the Basque Country and Northern Ireland are also often made, together with the statement that the current Basque Statute devolves more powers than the Stormont Agreement.

"It's the statue, man, The Statue."