4. Priority as between orders

(1) Where the employer is required to comply with two or more attachment of earnings orders in respect of the same debtor, all or none of which orders are made to secure either the payment of judgment debts, then on any pay-day the employer shall, for the purposes of complying with Part 1 of this Schedule 2 —
(a) deal with the orders according to the respective dates on which they were made, disregarding any later order until an earlier one has been dealt with;
(b) deal with any later order as if the earnings to which it relates were the residue of the debtor's earnings after the making of any deduction to comply with any earlier order.
(2) Where the employer is required to comply with two or more attachment of earnings orders, and one or more (but not all) of those orders are made to secure the payment of judgment debts, then on any pay-day the employer shall, for the purpose of complying with Part 1 of this Schedule 2 —
(a) deal first with any order which is not made to secure the payment of a judgment debt (complying with sub-paragraph (1) if there are two or more such orders); and
(b) deal thereafter with any order which is made to secure the payment of a judgment debt as if the earnings to which it relates were the residue of the debtor's earnings after the making of any deduction to comply with an order having priority by virtue of sub-paragraph (a); and
(c) if there are two or more orders to which sub-paragraph (2)(b) applies, comply with sub-paragraph (1) in respect of those orders.