Glossary
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- Bibliography
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| NACTSO | National Counter Terrorism Security Office |
| NAO | National Audit Office |
| NART | Nuclear Accident Response Team (MoD) |
| NATS | National Air Traffic Services |
| NBC | Nuclear, Biological, Chemical |
| NCC | News Co-ordination Centre |
| NCC | Network Control Centre (LUL) |
| NCCDO | News Co-ordination Centre Duty Officer |
| NDG | News Dimension Group |
| NDS | News Digital Systems |
| NFDC | National Federation of Demolition Contractors |
| NGC | National Grid Company |
| NHS | National Health Service |
| NI | Northern Ireland |
| NISCC | National Infrastructure Security Co-ordination Centre |
| Nitesun | Searchlight mounted on police helicopters |
| NORMACE | North Group mutual assistance plan to meet civil emergencies |
| NRES | National Rail Enquiry Service |
| NRF | National Resilience Framework |
| NRPB | National Radiological Protection Board |
| NSCWIP | National Steering Committee on Warning and Informing the Public |
| NSY | New Scotland Yard |