11.—(1) In performing the duties imposed on him by regulations 4(1)(a), 4(2), 5 and 7, the operator shall consult any other employer who carries out work with ionising radiation on the premises and shall for the purpose of compliance with those duties 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 shall co-operate with the operator by providing information or otherwise to the extent necessary to ensure that the operator is enabled to comply with the requirements of these Regulations (including the testing of emergency plans) in so far as his ability depends on such co-operation.
(3) Any person who is subject to a duty under these Regulations to prepare an emergency plan and any employer of any other person whose participation is reasonably required by any such plan shall co-operate with each other by the exchange of information or otherwise to the extent necessary to ensure that each person is enabled to comply with the requirements of these Regulations (including the testing of emergency plans) in so far as his ability to comply depends upon such co-operation.