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Companies should prepare to work without their IT systems at all, the UK’s cyber security chief has warned amid a surge in the number of hacks.

“Every organisation” should prepare for a potential attack including by planning for operating without technology, said Richard Horne, the chief executive of the National Cyber Security Centre.

The warning comes amid a drastic increase in the number of “nationally significant” cyber attacks, and hacks that have taken down M&S and Jaguar Land Rover, leaving them without key systems for weeks.

“From local coffee shops to providers of critical national infrastructure, every organisation must understand their exposure, build their defences and have a plan for how they

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