Northern Ireland: New Constituency Boundaries 2018

Each new seat can be described as a combination of parts of old seats. These tables show this decomposition. The winner of the old seat at the 2019 election is shown by party colour, as is the implied winner of the new seat.

The implied results are calculated using the local election results for the wards which make up each old seat. This should give the most accurate projection, since it reflects varying political behaviour across the seat.

Northern Ireland Change Table

Party	Old Seats	New Seats	Change	Disappear
UUP	0	0	0	0
SDLP	2	2	0	0
DUP	8	7	-1	-1
Alliance	1	1	0	0
Green	0	0	0	0
SF	7	7	0	0
MIN	0	0	0	0
Total	18	17	-1	-1

The table shows how the various changes affect each party in this area. The total old and new seats are shown for each party, as well as their difference ('Change'). The change in seats is also explained through the four explanations:

Disappear : seats which have disappeared as they are broken into small fragments
Switch Out : seats lost because their political make-up has altered
Switch In : seats gained because their political make-up has altered
Fresh : freshly created new seats which are made up of small fragments of old seats

The old seats which are disappearing are: Antrim South.

Antrim

New seat	Primary component	Secondary component(s)
Antrim East	91.7% of Antrim East	24.2% of Antrim South
Antrim Mid	72.9% of Antrim North	21.2% of Antrim South 0.7% of Antrim East
Belfast East	97.3% of Belfast East	9.6% of Down North 3.0% of Belfast South
Belfast North	92.2% of Belfast North	8.8% of Antrim South 6.2% of Antrim East
Belfast South	97.0% of Belfast South	4.4% of Strangford 3.5% of Lagan Valley 2.7% of Belfast East 0.2% of Belfast West
Belfast West	99.8% of Belfast West	8.1% of Lagan Valley 7.8% of Belfast North

Armagh

New seat	Primary component	Secondary component(s)
Newry and Armagh	94.3% of Newry and Armagh	1.9% of Down South 0.8% of Fermanagh and South Tyrone
Upper Bann	82.0% of Upper Bann	4.5% of Newry and Armagh 0.6% of Fermanagh and South Tyrone 0.1% of Lagan Valley

Down

New seat	Primary component	Secondary component(s)
Antrim South	62.8% of Lagan Valley	45.8% of Antrim South
Down Mid	69.9% of Strangford	25.3% of Lagan Valley 15.4% of Upper Bann 2.6% of Down South
Down North	90.4% of Down North	23.0% of Strangford
Down South	95.5% of Down South	2.5% of Upper Bann 2.7% of Strangford 1.2% of Newry and Armagh 0.2% of Lagan Valley

Fermanagh

New seat	Primary component	Secondary component(s)
Fermanagh and South Tyrone	98.7% of Fermanagh and South Tyrone	2.4% of Ulster Mid

Londonderry

New seat	Primary component	Secondary component(s)
Causeway	78.4% of Londonderry East	27.1% of Antrim North 1.4% of Antrim East
Foyle	100% of Foyle	1.4% of Tyrone West
Sperrin	98.6% of Tyrone West	14.4% of Londonderry East 0.0% of Foyle

Tyrone

New seat	Primary component	Secondary component(s)
Ulster Mid	97.6% of Ulster Mid	7.1% of Londonderry East