It was a defining moment, the first time 'Jihadi John' appeared. Suddenly Islamic State had a face and the whole world knew the extent of their savagery. Weeks later, when his identity was revealed, Robert Verkaik was shocked to realise that this was a man he'd interviewed years earlier.

Back in 2010, Mohammed Emwazi was a twenty-one-year-old IT graduate who claimed the security services were ruining his life. They had repeatedly approached him, his family and his fiancee. Had they been tracking an already dangerous extremist or did they push him over the edge?

In the aftermath of the...

If we care about inequality, we have to talk about private schools