6The conditions in paragraph 5 above do not apply to a transaction entered into by the listed institution as mentioned in paragraph (a), (b) or (c) of paragraph 4(1) above if—
(a)the unlisted person mentioned in paragraph (a) or (b) or, as the case may be, each of the unlisted persons mentioned in paragraph (c) has in the previous eighteen months entered into another transaction in respect of an investment specified in paragraph 2(2) above;
(b)those conditions were satisfied in the case of that other transaction; and
(c)that other transaction was entered into by that person (whether acting as principal or agent) with the listed institution (whether acting as principal or agent) or was entered into by that person through the agency of that institution or was entered into by him (whether acting as principal or agent) as a result of arrangements made by that institution.