Matt Chorley is joined by Lucy Fisher, senior political correspondent, who tells us about Labour's "purge", Matthew O'Toole, a former No10 Brexit spokesman, explains why it all comes back to Irish first principles, and Gideon Skinner, head of political research at Ipsos Mori, reveals the five political tribes crossing party and Brexit lines. Hosted on Acast. See acast.com/privacy for more information.