Sky News has been given exclusive access to a classified wargame that tested how the United Kingdom would respond to a major attack on home soil, revealing both the strengths and gaps in the country’s civil defence preparations.
A national stress test
The exercise brought together local authority officials, emergency service commanders, and military planners in a simulated crisis that stretched responding agencies to their limits. Containers of scenario data were opened one by one, each introducing a fresh complication: disrupted communications, casualty surges, and decisions about when to call in the armed forces to support civilian authorities.
The wargame was designed to test the boundaries between local resilience, police and fire command structures, and the military’s role in domestic emergencies. In the United Kingdom, the armed forces can be deployed at home in specific circumstances, but the threshold for that deployment is high and the chain of command is deliberately layered.
Why it matters
The exercise comes at a time when the UK’s defence posture is under sustained examination. The current government has signalled that national resilience and domestic security planning are priorities, and exercises like this one are intended to expose weaknesses before a real emergency forces them into the open.
For local councils and emergency services, the practical question is whether they have the funding, training, and political backing to respond to a large-scale domestic attack. The wargame’s findings will feed into wider reviews of how the UK prepares for threats that blur the line between civilian and military response.
What happens next
The results of the wargame are being taken forward by the departments and agencies that took part. Those involved will be looking at where decisions delayed responses, where communication broke down, and whether the procedures for bringing in military support would work in practice.
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Further exercises of this kind are expected, with the aim of turning the lessons from a simulated crisis into changes to training, planning, and funding. Whether those changes are matched by resources on the ground will be the test of how much the exercise achieves.
Source: Sky News UK
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