13.—(1) In rule G5 (purchase of increased benefits), after paragraph (3), there shall be inserted–
“(4) This rule is subject to rule N12.”;
(2) In rule G6 (election to purchase increased benefits), after paragraph (5), there shall be inserted–
“(6) This rule is subject to rule N12.”;
(3) In rule G7 (payment of periodical contributions for increased benefits), after paragraph (4), there shall be inserted–
“(5) This rule is subject to rule N12.”;
(4) In rule G8 (effect of payment for increased benefits), after paragraph (6), there shall be inserted–
“(7) This rule is subject to rule N12.”.