The life-long nature of adoption and recognition of the often-fragile nature of post-reunion relationships, means adoption agencies have a duty of care and moral onus to facilitate comprehensive support services that can be readily accessed. The Health and Social Care (HSC) Trust Post-Adoption Service was established in 1989, in response to the legislative changes brought about by The Adoption (Northern Ireland) Order 1987. This study employed retrospective file analysis and a purposive sample of 15 Case Files, drawn from a 10-year period (2009-2018), to explore reunifications between adopted adults and their birth relatives, from the time of initial involvement and over the longer term. The use of an Advisory Panel of professional experts, a Pilot Study and a specifically created Data Collection Form, enhanced overall rigour and robustness. Thematic analysis of the data identified common themes of curiosity; identity related; meeting the birth mother; and death of adoptive parents/loss; leading to meta-themes of identity and loss. Key findings include the diversity amongst service users accessing the service in terms of their gender, age and life stage; their motivations; the time-restricted nature of current involvement; protracted timescales from initial contact to search is not uncommon; that "post-reunion" social work involvement saw a marked drop from pre-contact levels, particularly for birth relatives. The study makes a compelling case for a well-resourced service that offers additional pre- and post-reunion support and argues for a more proactive professional approach, with further expansion of existing support provision.