Rowena Mason and Zoe Williams look at the potential consequences of the bombshell video that has thrown doubt on Boris Johnson’s repeated denials that there was a Christmas party at No 10 last year. Plus: Aubrey Allegretti, Peter Walker and Jessica Elgot look at what the byelections tell us about the need for a progressive alliance. Help support our independent journalism at <a href="https://www.theguardian.com/politicspod">theguardian.com/politicspod</a>