These Regulations provide for the Secretary of State to give a direction (a “security direction”) in response to certain types of urgent security threat. The Secretary of State may direct those persons responsible for a civil nuclear site, nuclear or other radioactive material stored on part of a nuclear site, a nuclear construction site or other nuclear premises, the transport of nuclear material, or those persons holding sensitive nuclear information or equipment or software relating to uranium enrichment. The power to direct arises where the Secretary of State is satisfied that those premises or that material or information is at risk from an imminent threat of terrorism, espionage, sabotage or theft. It also arises where the Secretary of State is satisfied that there is an imminent threat of sensitive nuclear information or equipment or software relating to uranium enrichment being compromised or disclosed.