or the purposes of returning the information to DfE. It is up to the local authority how they track down the UPN and we cannot offer legal advice to local authorities on obtaining UPNs. For looked after children that have been adopted during the year, the UPN on the child’s pre and post-adoption records should be different. Further information on UPNs is available in DfE’s UPN guide for schools and local authorities. This link also contains information on the assignment of new UPNs to adopted children. 2.2.1 UPNs for children educated outside of a local authority The use of Key to Success (KtS) is derived from legislation which gives the Secretary of State (SoS) the power to grant a certain degree of sharing; more information is available from Key to Success. However, Key to Success cannot be used to identify the details of pupils attending schools in boroughs or local authorities who are not your own, unless the child is a looked after child (your local authority is the corporate parent) and the child is placed outside your own local authority. Where children attend schools outside of your local authority it is possible you may not hold their UPN, if you do not already do so for other reasons. In this case, please add a note to your children in need return to explain why the UPN information is not available. 2.3 Pupil’s former UPN This is where a pupil had held another UPN, for example a temporary UPN when they were first admitted to a school, but has subsequently been given a permanent UPN. Where a looked after child has been adopted during the year and this is the child’s post- adoption record, do not enter the pre-adoption UPN in this field; leave it blank instead. 28 2.4 UPN unknown reason This item is optional and is included to assist local authorities in informi