Last night, Andrew Neil suggested that the policies to which Diane Abbott subscribed had never won Labour a General Election. He did not specify whether he meant, for example, her sympathy for the 11-plus, for single-sex schools, for Oxbridge as academically elitist, for universities' flexible approach to entry grades if they see potential in the applicant, for the prevention of social rather than academic elitism by improving the schools attended by the poor, for raising poor pupils' aspirations so that they actually apply to the top universities, and for reinstating full grants so that they can afford to go.
Nor whether he had in mind her consistent opposition to European federalism, or her role as a voice of her ethnic community on immigration by people who cannot speak English or who come from countries with no historic ties to Britain, or her support for action against such things as not giving up seats to elderly people on public transport, or her opposition to the New Labour assault on civil liberties.
All in all, no wonder that she hated both Thatcherism and Blairism so much.
However, Neil did eventually mention "scrapping Trident" and "unilateral nuclear disarmament", which are not the same thing as each other. The first is now the position of, among other people, Michael Portillo, and has never been tested at the ballot box. Nor, for that matter, has the second. It did not become Labour Party policy until the year after the 1983 Election and, as much as anything else, two years after the secession of the SDP.