Where a sewerage undertaker is about to take into consideration the question of making a declaration under section 102 above with respect to—
it shall give notice to the other undertaker.
Where a sewerage undertaker is required to give notice under subsection (1) above to another undertaker, no declaration under section 102 above shall be made by the former undertaker until either—
Where—
a sewerage undertaker shall not make a declaration under section 102 above with respect to (as the case may be) the sewer, or part of it, or the lateral drain or the works, except on the application of the relevant body concerned.
Where a sewerage undertaker makes a declaration under section 102 above with respect to—
it shall forthwith give notice of the fact to that other undertaker.
In this section "relevant body" means any sewerage undertaker, any local authority or county council or any railway undertakers or dock undertakers.