4.—(1) An enforcing authority must co-operate with—
(a)other enforcing authorities;
(b)a competent authority;
(c)the equivalent of an enforcing authority in another member State; and
(d)the European Chemicals Agency,
where this will facilitate compliance with, or the effective enforcement of, REACH in the European Union.
(2) An enforcing authority must disclose to a person referred to in paragraph (1) information it holds in relation to compliance with, or the enforcement of, REACH where it believes—
(a)it is reasonable for it to make that disclosure; and
(b)the disclosure will facilitate compliance with, or the effective enforcement of, REACH in the European Union.
(3) The Commissioners for Revenue and Customs may disclose to an enforcing authority information obtained or held by the Commissioners in exercise of their functions in relation to imports—
(a)where the Commissioners believe it is appropriate to do so to facilitate the exercise of the duty of an enforcing authority under these Regulations; and
(b)whether or not the information has been requested by the enforcing authority.