After dozens of ministerial resignations, Boris Johnson announced he would step down as the prime minister of the United Kingdom on Thursday, after surviving years of political scandals and personal missteps. 

So what sort of politician was he really? 

And what legacy does he leave behind? 

Today, behavioural scientist Stephen Reicher on why he thinks Boris Johnson was far more dangerous for British democracy than his cavalier approach might suggest.

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Professor Stephen Reicher, behavioural scientist, School of Psychology and Neuroscience, University of St Andrews, Fife, Scotland