That and the party eating itself from the inside, significantly (but far from only) due to bad handling of the anti-Semitism issue. Also not really having a po

That and the party eating itself from the inside, significantly (but far from only) due to bad handling of the anti-Semitism issue. Also not really having a policy on brexit, and letting it be one of the issues the party fought inwardly about, made brexit a policy issue so it is hard to make the distinction that you do above: there are people who would have voted if a more direct stance against was taken. (context: remain and Labour voter in all the key national polls in recent years, but they never managed to make themselves look better than "vaguely better one from a terrible set of options" even to the likes of me so convincing floating voters to swing that way was not going to happen)