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The Chancellor has promised hundreds of millions more would be spent defending Britain from attack on its critical computer systems.

But what if the system you were trying to defend was inaccessible, what if you weren't allowed to examine its computer code?

For Norwegian computer security expert Marie Moe this is a reality. She had a pacemaker fitted after collapsing at work and, speaking to PM, she said she鈥檚 worried about it being hacked:

鈥淚t鈥檚 a computer running my heart so I really have to trust this computer and it鈥檚 a little bit hard for me because I don鈥檛 have any way of looking at the software running on this device鈥� she told Chris Vallance.

Marie is calling for more research to be done into the risks of hacking pacemakers.