4. Where in the agreements set out in the Schedules to the Orders in Council and Orders made by the Secretary of State specified in Schedule 2 to this Order, there are provisions for the determination of entitlement to an old age pension or basic retirement pension (or any equivalent terms), those provisions shall be altered so that they apply for the purposes of entitlement to a state pension under section 2 or 4 of the Pensions Act (Northern Ireland) 2015 in the following way—
(a)the United Kingdom shall take account of contribution periods or equivalent periods completed by a person under the legislation of the other Party or Parties only for the purpose of determining whether that person has the minimum number of qualifying years for entitlement to a state pension under section 2 or 4 of the Pensions Act (Northern Ireland) 2015;
(b)the United Kingdom shall pay to a person an amount of state pension under section 2 or 4 of the Pensions Act (Northern Ireland) 2015 based only on the contributions paid, credited or treated as paid under its legislation.