15.—(1) In performing the duties imposed on an operator under regulations 4(1), 5(1), 6(1) and (2), 7(1) and 10, that operator must consult any other employer who carries out work with ionising radiation on the premises and take into account relevant matters arising from that consultation.
(2) Any employer who carries out work with ionising radiation at premises to which these Regulations apply must cooperate with the operator of those premises or the local authority in whose area the premises is situated by providing information or otherwise to the extent necessary to ensure that the operator or local authority, as the case may be, is able to comply with the operator and the local authority's duty to prepare an emergency plan.
(3) Any employer of any other person whose participation is reasonably required by any emergency plan required under these Regulations must co-operate with the operator or the local authority, as the case may be, in the exchange of information or otherwise to the extent necessary to ensure that the operator or the local authority is enabled to comply with the requirements of these Regulations, insofar as the operator or the local authority's ability to comply depends on such co-operation.
(4) The co-operation required by an employer under paragraphs (2) and (3) extends to co-operation in the testing of emergency plans where such co-operation is necessary to secure compliance with regulation 12.