The Assessor of Public Undertakings (Scotland) (hereinafter referred to as “the Assessor”) shall for the year 1967-68 and each subsequent year determine in accordance with the following provisions of this and the next succeeding Part of this Schedule the cumulo rateable value of lands and heritages occupied for the purposes of a water undertaking, other than excepted premises, F1and shall enter such value in the valuation roll.

In this paragraph “excepted premises” means dwelling-houses, or lands and heritages held by a local water authority under a lease for a period not exceeding twenty-one years.