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Shock plans obtained under Freedom of Information laws also suggest Facebook and Twitter could be used to warn Britons about looming destruction.

Back in the Cold War the last thing we would have heard before a nuclear explosion was the spine chilling wail of an air raid siren.

But it has emerged Britain’s networks of sirens were ditched in the early 90s after the Soviet Union collapsed to save cash – even though most other countries decided to keep theirs.

Yet in its last national security review the Government said the threat from nuclear armed Russia was back on for the first time since the fall of the USSR.

As reported, in the past year reports have been emerging of a range of nuclear war projects under way in Russia, which should be making us scared. Very scared.

As well as ditching the sirens the Government has not made an updated version of the chilling 1970s and 80s public information films (see above) that scared a whole generation witless.

Instead practical advice on nuclear fallout shelters, food and removing and name tagging dead bodies from your home would be posted on Facebook.

Responding to a Freedom of Information request, a Home Office statement said: "The fundamentals of the types of actions individuals can take to protect themselves from nuclear, chemical, or biological hazards have not changed since the 1970s and 80s.

"But technology and communications developments have opened a wide range of very powerful tools to disseminate information rapidly from broadcast through to the internet, SMS text messaging and social media.

"Research has shown that simple and effective communication with victims of a nuclear, chemical, or biological emergency is vital to a successful response."

But there is only one snag which may mean tuning into the radio is the best option in post-nuclear Britain.

According to documents seen by Daily Star Online, should the bomb fall and telephone lines and mobile phone masts be blown down in the blast, the Government has in place a special telecommunication system that will operate after a severe nuclear attack across Britain’s regions.

Under a system code named HITS, special military satellites will be able to continue for phone and internet coverage.

But forget being able to use it to phone or message your mum on Facebook, as this is only available to those in special bunkers dotted around the UK which will take over running what is left of Britain and Northern Ireland.

And the threat of nuclear war is all too real.

(Image: CABINET OFFICE)

In the latest Strategic Defence and Security Review it refers to a "resurgence of state-based threats" for the first time in decades.

It says: "Russia is mid-way through a programme of major investment to modernise and upgrade its military, including its nuclear forces.

"It has also increased its nuclear exercises and rhetoric, with threats to base nuclear forces in Kaliningrad and Crimea.

“Its military activity around the territory of our Allies, and close to UK airspace and territorial waters, is designed to test our responses.

"Russia’s behaviour will continue to be hard to predict, and, though highly unlikely, we cannot rule out the possibility that it may feel tempted to act aggressively against NATO Allies.”

Meanwhile, USAF stealth bombers have been testing nuclear weapons as the Pentagon readies its stockpile for war, according to Pentagon officials.