“4.2 Underpinning the parity principle is the argument that, as people in Northern Ireland pay the same rates of income tax and National Insurance contributions as people in Great Britain, they are entitled to the same rights and benefits paid at the same rates. Also, when people move between the two territories, they should be able to enjoy the same entitlement to benefit generated by their National Insurance contributions and should not have to make another claim to the same benefit or return home if they wish to appeal an entitlement decision made in their home territory.”
‘3. Where the determining authority has made a decision relating to a claim for benefit arising under or in connection with the legislation, including a decision as revised or superseded, (a) the decision may be revised or superseded; and (b) any appeal from the decision may be determined under and to the extent permitted by the legislation of the territory in which the claimant is, as if the decision had been made in that territory, notwithstanding that the decision was made in the other territory.’