There are currently 5 security levels in the UK. With details of what each one means and also the procedure which we think you should take
Top secret
Information marked as Top secret is that which whose release is liable to cause considerable loss of life, international diplomatic incidents, or severely impact ongoing intelligence operations.
Secret
This marking is used for information whose side-effects may be life-threatening, disruptive to public order or detrimental to diplomatic relations with friendly nations.
Confidential
The effects of releasing information marked as Confidential include considerable infringement on personal liberties, material damage to diplomatic relations, or to seriously disrupt day-to-day life in the country.
Restricted
Information marked as Restricted is at a level where the release of the material will have effects such as significant distress to individuals, adversely affecting the effectiveness of military operations, or to compromise law enforcement. In many cases, information held by personnel offices in Government departments will be marked as Restricted with the additional tag Staff, such that access requires clearance both for the marking and the tag.
Protect
Compromise of the information would be likely to affect individuals in an adverse manner.
