BRIGHTON, ENGLAND - SEPTEMBER 28:  Shadow chancellor John McDonnell addresses the Labour Party autumn conference on September 28, 2015 in Brighton,England. Mr McDonnell told activists in Brighton that austerity was a "political choice not an economic necessity" he also promised to match Jeremy Corbyns new politics with a new economics, including a pledge that the next Labour government would live within its means.  (Photo by Jeff J Mitchell/Getty Images)