4. Without prejudice to any other provisions of these Regulations, this Regulation and the three next succeeding Regulations shall apply in relation to and only in relation to any officer or servant to whom these regulations apply, whose existing scheme provides for pensions by means other than those specified in paragraph (1) of the last preceding Regulation and in respect of whom no such arrangements have been made as are referred to in paragraph (2) of that Regulation or if such arrangements have been made, the arrangements have been duly determined: and notwithstanding anything to the contrary in the said scheme or any statutory provisions relating thereto or trust deeds, rules or other instruments made for the purposes thereof, the persons administering the said scheme and the persons in whom any pension funds held for the purpose thereof are vested, shall be required and authorised to comply with the provisions of the said Regulations, and the said scheme, statutory provisions, trust deeds, rules and other instruments shall be construed accordingly and as though the provisions of the said Regulations which affect the said scheme or fund were included in the scheme.