10In section 41(3) of that Act (under which a person is liable on summary conviction to a fine not exceeding £5 if he does certain work in connection with an underground drain, which communicates with a sewer without giving 24 hours notice to the relevant local authority of his intention to do so or if he does not permit an authorised officer of the local authority free access to the work) for the words " five pounds" there shall be substituted the word " £100 ".