What was the recipe for the success of the British Left?

The Labour organization in the past was under the regulation of politicians who were considered personally decent but politically uninspiring (Ed Miliband) or unacceptablely extremist (Jeremy Corbyn). With the end of an era defined by austerity and pursuit of extremist right-wing politics, the Keira Starmer labour organization has both a chance and a mandate to push forward a fresh set of policies.