![Boris Johnson has triggered a bumper by-election bonanza – I studied 148 past contests to find out what we can expect](/content/images/size/w600/2023/06/www-0585.jpg)
UK Politics
— Boris Johnson and two of his supporters have left parliament, triggering three by-elections which could be crucial for the future of British politics. What can the history and patterns of by-elections tell us about the chances of a change in power?