reg 11 Co-operation and co-ordination
(1) Where two or more employers share a workplace (whether on a temporary or a permanent basis) each such employer shall— (a) co-operate with the other employers concerned so far as is necessary to enable them to comply with the requirements and prohibitions imposed upon them by or under the relevant statutory provisions ...; (b) (taking into account the nature of his activities) take all reasonable steps to co-ordinate the measures he takes to comply with the requirements and prohibitions imposed upon him by or under the relevant statutory provisions ... with the measures the other employers concerned are taking to comply with the requirements and prohibitions imposed upon them by that legislation; and (c) take all reasonable steps to inform the other employers concerned of the risks to their employees’ health and safety arising out of or in connection with the conduct by him of his undertaking. (2) Paragraph (1) ... shall apply to employers sharing a workplace with self-employed persons and to self-employed persons sharing a workplace with other self-employed persons as it applies to employers sharing a workplace with other employers; and the references in that paragraph to employers and the reference in the said paragraph to their employees shall be construed accordingly.