Sir, The very notion of awarding a “deferred peerage” to sitting MPs is, at best, constitutionally dubious (“Sunak faces three by-elections over MPs ennobled by Johnson”, May 17). It blurs a boundary that exists separating membership of the two chambers. This proposal adds to the list of constitutional infractions perpetrated or attempted by Boris Johnson. Few people have done more, wittingly or unwittingly, to highlight weaknesses in the British constitution and make the case for reform than he has. If we fail to take note and appropriate action, then we can hardly complain if any future prime minister pushes beyond the bounds of constitutional propriety.

James Mitchell

Professor of public policy, University of Edinburgh

Sir, I wonder why prime ministers invest so much

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