(1) A person may disclose information to any of the intelligence services for the purposes of the exercise by that service of any of its functions.

(2) Information obtained by any of the intelligence services in connection with the exercise of any of its functions may be used by that service in connection with the exercise of any of its other functions.

(3) Information obtained by the Security Service for the purposes of any of its functions may be disclosed by it -

(a) for the purpose of the proper discharge of its functions,

(b) for the purpose of the prevention or detection of serious crime, or

(c) for the purpose of any criminal proceedings.

(4) Information obtained by the Secret Intelligence Service for the purposes of any of its functions may be disclosed by it -

(a) for the purpose of the proper discharge of its functions,

(b) in the interests of national security,

(c) for the purpose of the prevention or detection of serious crime, or

(d) for the purpose of any criminal proceedings.