§ 30. The conditions mentioned in paragraph 1 of Part I of the principal Schedule shall be deemed to include the condition that the scheme must provide for a participant's contributions under the certified contractual savings scheme to be payable under arrangements made with the company of which he is a director or employee and to be of such amounts as to secure as nearly as may be repayment of an amount equal to that for which shares may be acquired in pursuance of rights obtained by him under the share option scheme; and for this purpose the amount of the repayment under the contractual savings scheme shall be determined as mentioned in paragraph 23 above.