16. Where work with ionising radiation undertaken by one employer is likely to give rise to the exposure to ionising radiation of the employee of another employer, the employers concerned shall co-operate by the exchange of information or otherwise to the extent necessary to ensure that each such employer—
(a)has access to information on the possible exposure of their employees to ionising radiation; and
(b)is enabled to comply with the requirements of these Regulations in so far as their ability to comply depends upon such co-operation.