how do you get a top secret security clearance
Security clearance A security clearance is a status granted to individuals allowing them access to classified information (state or organizational secrets) or to restricted areas, after completion of a thorough background check. The term "security clearance" is also sometimes used in private organizations that have a formal process to vet employees for access to sensitive information. A clearance by itself is normally not sufficient to gain access; the organization must also determine that the cleared individual needs to know specific information. No one is supposed to be granted automatic access to classified information solely because of rank, position, or a security clearance.[1]
Downing Street Since 1989, entering Downing Street has required passing through a security checkpoint. The street is patrolled by armed police from the Diplomatic Protection Group, and there is usually at least one police officer outside the front door of Number 10. Security was tightened after 10 Downing Street was mortar bombed by the IRA in 1991.