Pt. 1. Threats: 1. Introduction -- 2. Setting the scene: the threat picture in a globalized world -- 3. Tier one threats -- 4. Tier two threats -- 5. Tier three risks -- Pt. 2. Responses: 6. Responses -- Pt. 3. Strategies: 7. Administering national security: governmental strategies and structures -- 8. Boots on the ground: restructuring military capability -- 9. Fighting asymmetric conflicts -- 10. Domestic policies: counter-radicalization and counter-terrorism -- 11. Partnerships: EU, UN, NATO, and the 'Special Relationship' -- 12. Conclusions.