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Martin Redfern seems obsessed with Nicola Sturgeon (Letters, 17 April), and the “manufactured grievances” with Westminster were validated this week by the head of the civil service in Scotland, John-Paul Marks, who told MPs on Tuesday that UK ministers had flouted the Sewel Convention, which dictates that Westminster does not legislate in devolved matters without the consent of the Scottish Government, “on a number of occasions” in recent years. He also said that the controversial Internal Market Act, the devolution-busting legislation which helped scupper the deposit return scheme, had changed the nature of devolution.