“4.— Circumstances in which proposals may be made (1) The grounds for making a proposal are— … (h) a hereditament shown in the list ought not to be shown in that list; (i) the list should show that some part of a hereditament which is shown in the list is domestic property or is exempt from non-domestic rating but does not do so; …”
“(6) Where the rateable value is determined with a view to making an alteration to a list which has been compiled (whether or not it is still in force) the matters mentioned in sub-paragraph (7) below shall be taken to be as they are assumed to be on the material day. (6A) For the purposes of sub-paragraph (6) above the material day shall be such day as is determined in accordance with rules prescribed by regulations made by the Secretary of State.
“3 – Material day for list alterations (1) For the purposes of sub-paragraph (6) of paragraph 2 of Schedule 6 to the 1988 Act, the material day shall be determined in accordance with paragraphs (2) to (7) below. … (4) Where the determination is with a view to making an alteration so as to show in, or delete from the list any hereditament which- (a) has come into existence or ceased to exist; 8 (b) has …become… property exempt from non-domestic rating; ... the material day is … the day on which the circumstances giving rise to the alteration occurred.”