§ Mr. Wilson
The UK's civil nuclear sites apply stringent security measures regulated by the Office for Civil Nuclear Security (OCNS), the security regulator. The security regulator works closely with the Health and Safety Executive, the safety regulator, which provides advice on the safety implications of events, including external hazards such as plane crashes, at nuclear installations. Security at nuclear sites is kept under regular review in the light of the prevailing threat and has been significantly enhanced since the terrorist attacks in the USA on 11 September 2001. It is not Government policy to disclose details of these measures, which could potentially be of use to terrorist under Exemption 1—Defence, Security and International Relation, of the Code of Practice on Access to Government Information.