4.—(1) This paragraph applies where another person ( “contractor C”) is authorised to exercise a function of another Department, Minister, office-holder or district council ( “authority C”).N.I.
(2) The enactment or obligation does not prevent or penalise the disclosure of relevant information by contractor A or an employee of his, or authority A or an authorised officer of that authority; to contractor C or an employee of his, if—
(a)the disclosure is necessary or expedient for the purpose of facilitating the exercise of the relevant function, a related function or a function of authority C;
(b)where the disclosure is by contractor A or an employee of his, the disclosure falls within a description of disclosures certified by authority A (whether in the authorisation or otherwise) to be capable of being so necessary or expedient; and
(c)the information could be lawfully disclosed, for that purpose, by authority A to authority C.