Sixteen days before the Brexit referendum, and only two days before the deadline to apply to cast a ballot, the IT system for voter registrations collapsed. The remain and leave campaigns were forced to agree a 48-hour registration extension. Around the same time, evidence was beginning to emerge of a major Russian “hack-and-leak” operation targeting the US presidential election. Inevitably, questions arose as to whether the Russians had successfully disrupted the Brexit vote.
The truth was more embarrassingly simple. A comprehensive technical investigation, supported by the National Cyber Security Centre – which I headed at the time – set out in detail what had happened. A TV debate on Brexit had generated unexpected interest. Applications spiked to double those projected. The website couldn’t cope and crashed. There was no sign of any hostile activity.
