11The valuation officer for a rating area shall from time to time—
(a)cause such alterations to be made in the valuation list for that area as may be requisite for deleting from the list any hereditament which, by virtue of subsection (2) of section six of this Act, is not liable to be rated ;
(b)make such proposals, under Part III of the Act of 1948, as may be requisite for excluding from the list any premises which form part of a hereditament shown in the list and which, by virtue of that subsection, are not liable to be rated, and for including in the list, as one or more separate hereditaments, so much of any such hereditament as remains liable to be rated;
(c)make such proposals under the said Part III as may be requisite for altering the list in consequence of any event whereby premises cease to be within the exemption from rating conferred by subsection (2) of section six of this Act.