Currently a Counter Terrorist Check (CTC) allows access where there is a specific threat from terrorism to government establishments.
Who needs to have a CTC level clearance? The purpose of the CTC is to prevent persons who may have connections with terrorist organizations, or who may be vulnerable to pressure from such organizations, from undertaking certain security duties where there is a risk that they could exploit their position to further the aims of a terrorist organization.
What does a CTC check involve? The CTC check includes a Basic Check and a check against Security Service (MI5) records and police records. Occasionally a candidate may be invited to attend an interview with a DfT security officer.
If you already have a valid CTC clearance, or higher, you are not required to undergo a separate criminal record check.
How long will it take to get a CTC Security Clearance? A CTC will normally take up to six months and it is usually valid for 3 years.