The biggest lie in British politics is that the Labour Party is a broad church. It is not. It consists of two separate, distinct parties, each with its own diametrically-opposed philosophy.
While Jeremy Corbyn is the nominal leader of the whole party, encompassing both left and right, he is the spiritual leader and conscience of the hard left, a party committed to red-blooded socialism and principled opposition, even if (preferably if) those principles prevent it from forming a government.
The right of the party (whose adherents self-describe variously as “soft left”, “moderates” or “New Labour”) believes first and foremost in winning elections and are prepared to make whatever compromises they need to in order to do so. They are the “half a loaf is better than no loaf at all” wing of the party, and they have nothing in common with their hard left compatriots other than a matching membership card.