Or was it a group of Jews, celebrating Passover in the way that Jews do, who are constituents of Corbyn's, Oldwoman?
That they do not share the political views of other Jews should surely be neither here or there. If he had joined a Christian group for an Easter celebration would you be questioning the politics of the group? You, like others, are now suggesting these people are "the wrong kind of Jew". How would you describe calling someone "the wrong kind of Jew". I know how I would. Are we really saying one, self-appoint group, who share a religion can tell another group how they should think politically - nothing to do with religion - simply because they also share that religion.
Why doesn't Starmer hold another referendum?

