The December election that now looks inevitable will be, as all elections are, a test. A test of a decade-old government that isn’t entirely sure what its achievements in office have been. A test of the public’s continuing appetite for Brexit and its tolerance for parliamentary histrionics. A test, too, of whether the country is ready to return to majoritarian government or whether volatile voter intentions and hung parliaments will be with us a while longer.
None of these is the most important metric.