Security Clearance Requests UK personnel security clearance (PSC) levels.
The UK only has two types of PSC which are valid for accessing international classified
These are: Security Check (SC) – Permits access to international classified information up to and including the level of SECRET.
Developed Vetting (DV) – Permits access to international classified information at TOP SECRET level and below.
Occasionally international partners may see references of a UK process known as the, Baseline Protective Security Standard‟ (BPSS). This is a pre-employment recruitment, check (not a PSC) that is undertaken by UK departments, agencies and Government sponsored contractors that permits limited access to UK classified information. The BPSS, by itself, does not permit individuals access to international classified information CONFIDENTIAL or above.
In addition, international partners may hear of individuals who have undergone what is known as a „Counter-Terrorism Check‟ (CTC). This is a check conducted by the UK security authorities under certain conditions in the context of access to sensitive sites. A CTC does not permit individuals access to any UK or international classified information.
Full PDF and all its new measures on this link: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/249271/NSA_Security_Notice_01-2012-_Personnel_Security__14-09-2012_-1.pdf