85(1)
If in the course of the exercise of their functions any information comes to the notice of any local authority which leads them to suppose that a valuation list requires alteration as respects a hereditament it shall be the duty of that authority to inform the valuation officer.
85(2)
In this section, the expression " local authority " means the council of a county, county borough, London borough or county district, the Greater London Council, or the Common Council of the City of London, and includes any joint committee of any two or more local authorities and any joint authority on which any local authority are represented.