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A leading cybersecurity expert has warned that the NHS remains vulnerable to further cyber-attacks unless it updates its computer systems. This stark assessment comes in the wake of a major ransomware attack that has severely disrupted healthcare services across London. Prof Ciaran Martin, the founding CEO of the UK's National Cyber Security Centre (NCSC), told the Â鶹Éç: "I was horrified, but not completely surprised. Ransomware attacks on healthcare are a major global problem." Prof Martin's warnings suggest more urgent action may be needed. He's been speaking to Salma El-Wardany on Â鶹Éç Radio London. (Image credit: Getty Images)