reg 26 Co-operation requirements for safety critical work
(1) Every controller of safety critical work to whom this Part applies shall co-operate as far as is necessary with any other controller of safety critical work or any operator to enable that other controller of safety critical work to comply with the provisions of this Part. (2) Every person carrying out safety critical work shall, as regards any requirement imposed on any controller of safety critical work under this Part, co-operate with that controller of safety critical work so far as is necessary to enable that requirement to be performed or complied with.