"We are primarily a foreign-focused intelligence agency, with a signals intelligence role that can only be exercised for three limited purposes:
In the interests of national security
In the interests of the economic well-being of the UK
In support of the prevention or detection of serious crime."
http://www.gchq.gov.uk/how_we_work/running_the_business/over...
"We are primarily a foreign-focused intelligence agency, with a signals intelligence role that can only be exercised for three limited purposes: In the interests of national security In the interests of the economic well-being of the UK In support of the prevention or detection of serious crime."