19(1)Where (as determined in accordance with paragraph 4(3) and (4)) the value of any interest—E+W
(a)when held by the person from whom it is to be acquired by the nominee purchaser, or
(b)when acquired by the nominee purchaser,
is a negative amount, then for the purposes of paragraph 4(2) the value of the interest when so held or acquired shall be nil.
(2)Where, in the case of any property, sub-paragraph (1) above applies to any leasehold interest in the property whose value when held or acquired as mentioned in paragraph (a) or (b) of that sub-paragraph is a negative amount, paragraph 18(2) to (4) shall apply for determining for the purposes of paragraph 4(2) the value when so held or acquired of other interests in the property, as if—
(a)any reference to paragraph 18(1) were a reference to sub-paragraph (1) above; and
(b)any reference to the relevant purposes were, as respects any interest, a reference to the purposes of paragraph 4(2) as it applies to the interest when so held or acquired.
(3)In this paragraph any reference to any provision of paragraph 4 is a reference to that provision as it applies in accordance with paragraph 12(1).
(4)References in paragraph 20 or 21 to paragraph 18(2) or (3) do not extend to that provision as it applies in accordance with sub-paragraph (2) above.