Below is an interview with one of the human rights groups which challenged the murky policy demanding that it be banned.

First though, some background to the issue.

British government policy holds implicitly that agents or informants operating for the state's security service, MI5, are permitted to commit crimes without fear of prosecution if those crimes are committed in the line of duty to protect national security.

This is tantamount to the British state granting its agents and proxies a "license to kill".