Boris Johnson won an 80-seat majority in 2019, redrawing the electoral map and threatening Labour with another decade in opposition. Less than four years later, the Conservatives are on their third leader in 12 months and are trailing in the polls. So how did the UK get here? The Guardian’s John Harris asks Prof Tim Bale, whose new book, The Conservative Party After Brexit, looks at what went wrong for the Tories. Help support our independent journalism at theguardian.com/politicspod