In section 24(2) of that Act (under which an occupier of trade premises who discharges trade effluent into sewers etc. without the consent of, or contrary to a direction given by or condition imposed by, the local authority is liable on summary conviction to a fine not exceeding £50 and a further fine not exceeding £20 for each day on which the offence continues after conviction) for the words “£50” and “£20” there shall be substituted the words “£200” and “£50” respectively.