45. Where the Board become liable in accordance with regulation 43 or 44 to make payments of statutory paternity pay or, as the case may be, statutory adoption pay to a person, the first payment shall be made as soon as reasonably practicable after they become so liable, and payments thereafter shall be made at weekly intervals, by means of an instrument of payment or by such other means as appears to the Board to be appropriate in the circumstance of any particular case.