In April, the Harris network of London schools was held to ransom by hackers. ‘The first thing I did was panic,’ said Sir Dan Moynihan, the chief executive. It wasn’t simply that their computers didn’t work; many of the 50 schools couldn’t function. Some couldn’t open because their internet-controlled doors were jammed shut. A demand for £3 million arrived. Moynihan pointed out this was a ‘completely insane’ amount for an educational charity to pay — but his pleas through an intermediary were ignored. The hackers insisted that unless Harris paid up, the schools would continue to be locked out of their networks, and sensitive data would be leaked online too. Harris had fallen victim to ‘ransom-ware’ criminals, today’s version of highway robbers.