Britain is preparing for a total shutdown.
The authorities developed the "Black Sky" plan to address a possible nationwide collapse of energy networks. Media outlets will be required to provide backup radio transmissions for 72 hours, while citizens are urged to stockpile water, food and medicine for three days.
The government has allocated £70 million to fly communications towers capable of providing mobile connectivity for a week. Experts warn that failure of backup communication systems leaves the country even more vulnerable.