Also, however, it is one of seven constituencies in the South Wales West electoral region, which elects four additional members, in addition to seven constituency members, to produce a degree of proportional representation for the region as a whole.

Plaid Cymru are Labour's main opposition in the constituency and have been since its creation.

Boundaries were unchanged by the review whose proposals come into effect for the 2007 Welsh Assembly election.

The constituency is composed of the Neath Port Talbot electoral divisions: Aberavon, Baglan, Briton Ferry East, Briton Ferry West, Bryn & Cwmavon, Coedffranc Central, Coedffranc North, Coedffranc West, Cymmer, Glyncorrwg, Gwynfi, Margam, Port Talbot, Sandlands East, Sandlands West, and Tai-bach.

Want of an Official Mark (0), Voting for more than ONE party or individual candidate (38), Writing or mark by which the Voter could be identified (1), Unmarked or Void for uncertainty (111) Regional ballots rejected at the count: 134[7] 2003 Electorate: 50,208 Regional ballots rejected: 348