Waterworks Clauses Act 1952

The undertakers shall, within six months from the time at which any pipes, conduits, or underground works have been laid down or formed by them, cause a survey and map to be made of the district within which any such pipes or underground works are laid, on a scale not less than 1 to 5 280, and shall cause to be marked thereon the course and situation of all existing pipes or conduits for the collection, passage, or distribution of water and underground works belonging to them in order to show all such underground works within the said district, and shall, within six months from the making of any alterations or additions, cause that map to be corrected, and such additions made thereto as may show the line and situation of all such pipes, conduits, and underground works as may be laid down or formed by them after the passing of the special Act.

That map and plan, or a copy thereof, with the date expressed thereon of the last time when it was so corrected, shall be kept in the office of the undertakers, and shall be open to the inspection of all persons interested in it within the said district.