OSNI 50k Parliamentary Constituencies 2008. Published here for OpenData. By download or use of this dataset you agree to abide by the LPS Open Government Data Licence.
The boundaries were delineated in 2008 under the Partliamentary Constituencies (Northern Ireland) Order 2008 and used for the 2010 elections.
Please Note for Open Data NI Users: Esri Rest API is not Broken, it will not open on its own in a Web Browser but can be copied and used in Desktop and Webmaps