It is 20 years since Tony Blair stormed to a landslide victory that ended Sir John Major’s political career. The scale and nature of Blair’s victory inevitably invited the question whether the Conservative Party, which had so obviously run out of ideas in government, could ever return to power.

How different 2017 looks. According to the polls, Theresa May could be about to emulate Tony Blair in sweeping almost all before her, and that poses the question of political recovery the other way round. How could Labour ever make it back to power, if it were to suffer a similarly crushing defeat on 8 June? Or, more broadly, is there potential for a progressive centre-left movement to take over from a Labour Party captured by left-wing activists?