122.—(1) Where a periodical payment is made or is due to be made at intervals of one week, the weekly amount shall be the amount of that payment.
(2) Where a periodical payment is made or is due to be made at intervals greater than one week and those intervals are monthly, the weekly amount shall be determined by multiplying the amount of the payment by 12 and dividing the product by 52.
(3) Where a periodical payment is made or is due to be made at intervals and those intervals are neither weekly or monthly, the weekly amount shall be determined by dividing that payment by the number equal to the number of weeks (including any part of a week) in that interval.
(4) Where a payment is made and that payment represents a commutation of periodical payments whether in arrears or in advance, the weekly amount shall be the weekly amount of the individual periodical payments so commuted as calculated under paragraphs (1) to (3) as appropriate.
(5) The weekly amount of a payment to which regulation 121 applies (period over which payments other than periodical payments are to be taken into account) shall be equal to the amount of the divisor used in calculating the period over which the payment or, as the case may be, the balance is to be taken into account.