Lagan Valley is an overwhelmingly unionist area which is home to the Secretary of State's official residence.
The sitting MP is Jeffrey Donaldson of the DUP.
Just over 66,000 people can vote there.
Lagan Valley is one of the most prosperous constituencies in Northern Ireland.
Northern Ireland's high-security prison is also located there and, until recently, the only city in the constituency did not have a hotel.
BBC Newsline's Julian O'Neill visited that city of Lisburn where he took a look at the issue of planning.
BBC NEWS CHANNEL
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