Once again the Constitution seems vulnerable to piecemeal reform arising out of sectional party interest

On Monday the House of Lords voted against changes to tax credits. In doing so, Osborne and Cameron have argued they have broken a constitutional convention, raising “issues that need to be dealt with”. But Sean Swan questions these claims by highlighting that neither the Parliament Act nor the Salisbury Doctrine has been breached as the changes were secondary legislation and did not appear in the Conservative Manifesto.