2Notwithstanding paragraph 1(1)(a) above, the policy—
(a)may provide for a payment to a person of an age not exceeding 18 years at any time not less than five years from the beginning of the term of the policy if the premium or premiums payable in any period of twelve months in the term of the policy do not exceed £13,
(b)may provide for a payment at any time not less than five years from the beginning of the term of the policy, if it is one of a series of payments falling due at intervals of not less than five years, and the amount of any payment, other than the final payment, does not exceed four-fifths of the premiums paid in the interval before its payment.