Cyber attacks caused fewer problems to communications networks than unrelated system failures and natural disasters. The average duration of cyber attacks was four hours whilst outages due to nature mainly storms and heavy snowfall lasted 36 hours. The number of incidents caused, or partly caused, by cyber attacks came out at 8 per cent; more than the 5 per cent where human error played a role but dwarfed by problems caused at least in part by system failure (76 per cent)”]