These Regulations give effect in Great Britain to amendments made to reciprocal arrangements relating to matters for which provision is made by the Child Support Act 1991, and, in Northern Ireland, by the Child Support (Northern Ireland) Order 1991. The amendments to the arrangements are related to the introduction of new rules for calculating child support maintenance, which were introduced by the Child Maintenance and Other Payments Act 2008 and the Child Maintenance Act (Northern Ireland) 2008. They make provision so that where the new calculation rules apply to a case, the case will be administered in the territory where the non-resident parent resides, and the provisions applying in that territory will apply.