Paragraph 12
The undertaker must, before placing any temporary structure or apparatus over the Canal required in connection with the maintenance or repair or renewal of a specified work, comply with the reasonable requirements of the authority, such requirements to include—
the undertaker providing the authority with 42 days’ written notice of this requirement so that, in particular, the authority may bring these works to the attention of users of the Canal; and
receiving approval from the harbour master, but such approval must not be unreasonably withheld or delayed
In the case of repair work carried out in an emergency the undertaker is only required to give such notice to the harbour master as may be reasonably practicable in the circumstances.