The UK public sector has reached a cyber resilience inflection point. A new Prime Minister has taken office, and significant machinery-of-government changes have already been announced, including the scrapping of DSIT, the department that had become the center of government digital, technology and cyber policy. Its responsibilities are now being redistributed across other parts of Whitehall, creating a new policy and delivery landscape for public sector leaders to navigate.

For years, cyber security was treated as a specialist operational discipline that was essential but largely delegated to technical teams. That model is no longer sustainable.…