The following section is substituted for section 7 of the Principal Act:
(a) Subject to subsection (4) and section 7A, the premium payable under any health insurance contract effected by a particular registered undertaking shall be the same as that payable under every other such contract (after due allowance has been made in respect of the payment of any premium by instalments) that -
(i) is effected by that undertaking,
(ii) is in respect of the same period as that to which the first-mentioned contract relates,
(iii) relates to the same health services as those to which the first-mentioned contract relates, and
(iv) provides for the same payments by the undertaking in respect of those services as those provided for by the first-mentioned contract.
(b) A registered undertaking shall not effect a health insurance contract that contravenes paragraph (a).
(c) A health insurance contract that complies with paragraph (a) (or which would comply with that paragraph but for its falling
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