What if Hugh Gaitskell had been able to repeal Clause IV in 1959 as he had hoped?
Presumably even in a best-case scenario the left wing of the Labour Party would break away to form a separate party ("Real Labour"?) but would this in the long term make what remained of Labour more electable, as he had hoped?
It would be strange to have a situation like the early 2000s, where all major parties were basically capitalist, given that the late 50s still had the postwar socialist consensus.