Cyber-warfare was is no longer simply science-fiction, it is now a military fact that hits hard.

 Military communications, power systems and nuclear processing plants have all been taken offline in recent years by purely digital attacks.

 The UK’s capability for this domain sits in the National Cyber Force, created three years ago as part of Strategic Command, bringing together military and intelligence teams for both defensive and offensive cyber operations.

 Kate Gerbeau talks to Lieutenant General Tom Copinger-Symes, the Deputy Commander of Stratcom, about the cyber threats the UK faces and how the force is tackling them.