the british spectrum is fucked.
to begin with, labour can't win without entering into a coalition arrangement with the snp. but, that's not actually the story behind their collapse into perpetual opposition status.
the reality is that labour has been cratered by the ukip. and, this is the same basic story as exists in france, as well as in the united states.
neither side of the labour split really understands what it needs to do to win. the corbyn wing isn't going to magically create left of centre votes out of nothing (and, like sanders, corbyn is hardly a leftist ideologue). nor are moderate tory voters going to move to some concept of new labour. further, the liberals are as moribund as they ever were...
snp can and should be dealt with in a coalition. the place where the votes that labour needs are sitting with is ukip. so, how can labour disarm their prejudices and bring them back into a class-focused party?
it doesn't matter who their leader is; so long as labour is bleeding support to ukip, the tories will remain in power.