| Lagan Valley | |
|---|---|
| County constituency for theHouse of Commons | |
![]() Interactive map of boundaries from 2024 | |
Location within Northern Ireland | |
| Districts of Northern Ireland | |
| Major settlements | Lisburn |
| Current constituency | |
| Created | 1983 |
| Member of Parliament | Sorcha Eastwood (Alliance) |
| Seats | 1 |
| Created from | |
Lagan Valley is aNorthern Ireland parliamentary constituency in theHouse of Commons of the United Kingdom covering the area of theLagan Valley including the south part ofCounty Antrim and the north-west part ofCounty Down.
ItsMP since the2024 general election isSorcha Eastwood of theAlliance Party.[2] This was the first time since its creation it did not elect aunionist MP.
The seat was created in 1983, as part of an expansion ofNorthern Ireland's constituencies from 12 to 17, and was predominantly made up from parts ofSouth Antrim andNorth Down in the area of theRiver Lagan. In their original proposals, in January 1980, the boundary commission proposed calling it "Lagan". In further revisions in 1995 it lost some areas to bothBelfast West andStrangford.
| 1983–1997 | The district ofLisburn, and in the borough ofCastlereagh the ward of Carryduff.[3] |
| 1997–2010 | In the district of Lisburn, the wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Derryaghy, Dromara, Drumbo, Dunmurry, Glenavy, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Seymour Hill, Tonagh, and Wallace Park; and in the district ofBanbridge, the wards of Dromore North, Dromore South, Gransha, and Quilly.[4] |
| 2010–2024 | In the district of Banbridge, the wards of Dromore North, Dromore South, Gransha, and Quilly and the Ballynahatty and Edenderry parts of the Belvoir ward of the City of Belfast; and in the city of Lisburn, the wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Dromara, Drumbo, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Seymour Hill, Tonagh, Wallace Park, and that part of Derryaghy ward lying to the south and east of the Derryaghy and Lagmore townland boundary.[5] |
| 2024– | In the district ofArmagh City, Banbridge and Craigavon, the wards of Aghagallon, the part of the Donaghcloney ward to the east of the western boundary of the 2010–2024 Lagan Valley constituency, Dromore, the part of the Gransha ward to the north of the southern boundary of the 2010–2024 Lagan Valley constituency, Magheralin, and Quilly; and in the district ofLisburn and Castlereagh, the wards of Ballinderry, Ballymacash, Ballymacbrennan, Ballymacoss, Blaris, Dromara, Harmony Hill, Hilden, Hillhall, Hillsborough, Knockmore, Lagan, Lagan Valley, Lambeg, Lisnagarvey, Maghaberry, Magheralave, Maze, Moira, Old Warren, Ravernet, Wallace Park, and White Mountain.[6] |
MPs from Lagan Valley have included two party leaders:James Molyneaux, leader of theUlster Unionist Party from 1979 to 1995 (having representedSouth Antrim from 1970 to 1979), andJeffrey Donaldson, leader of theDemocratic Unionist Party from 2021 to 2024, when he resigned as party leader and was suspended as a party member.[7]
| Election | MP[8] | Party | |
|---|---|---|---|
| 1983 | James Molyneaux[a] | UUP | |
| 1986 b | |||
| 1987 | |||
| 1992 | |||
| 1997 | Jeffrey Donaldson[b] | UUP | |
| 2001 | |||
| 2004 | DUP | ||
| 2005 | |||
| 2010 | |||
| 2015 | |||
| 2017 | |||
| 2019 | |||
| 2024 | Ind. Unionist[9] | ||
| 2024 | Sorcha Eastwood | Alliance | |

| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Alliance | Sorcha Eastwood | 18,618 | 37.9 | +10.8 | |
| DUP | Jonathan Buckley | 15,659 | 31.9 | −11.5 | |
| UUP | Robbie Butler | 11,157 | 22.7 | +4.2 | |
| TUV | Lorna Smyth | 2,186 | 4.5 | New | |
| SDLP | Simon Lee | 1,028 | 2.1 | −2.0 | |
| Green (NI) | Patricia Denvir | 433 | 0.9 | New | |
| Majority | 2,959 | 6.0 | N/A | ||
| Turnout | 49,081 | 60.0 | −0.2 | ||
| Registered electors | 82,201 | ||||
| Alliancegain fromDUP | Swing | +11.15 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| DUP | Jeffrey Donaldson | 19,586 | 43.1 | −16.5 | |
| Alliance | Sorcha Eastwood | 13,087 | 28.8 | +17.7 | |
| UUP | Robbie Butler | 8,606 | 19.0 | +2.2 | |
| SDLP | Ally Haydock | 1,758 | 3.9 | −3.6 | |
| Sinn Féin | Gary McCleave | 1,098 | 2.4 | −1.1 | |
| NI Conservatives | Gary Hynds | 955 | 2.1 | +1.1 | |
| UKIP | Alan Love | 315 | 0.7 | New | |
| Majority | 6,499 | 14.3 | −28.5 | ||
| Turnout | 45,405 | 60.0 | −2.2 | ||
| Registered electors | 75,675 | ||||
| DUPhold | Swing | −17.1 | |||
This seat saw a swing towards the Alliance Party of over 17%, and the largest decrease in vote share for the DUP at the 2019 general election.[15]
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| DUP | Jeffrey Donaldson | 26,762 | 59.6 | +11.7 | |
| UUP | Robbie Butler | 7,533 | 16.8 | +1.6 | |
| Alliance | Aaron McIntyre | 4,996 | 11.1 | −2.8 | |
| SDLP | Pat Catney | 3,384 | 7.5 | +1.2 | |
| Sinn Féin | Jacqui Russell | 1,567 | 3.5 | +0.6 | |
| NI Conservatives | Ian Nickels | 462 | 1.0 | −0.6 | |
| Independent | Jonny Orr | 222 | 0.5 | −1.4 | |
| Majority | 19,229 | 42.8 | +10.1 | ||
| Turnout | 45,044 | 62.2 | +6.3 | ||
| Registered electors | 72,380 | ||||
| DUPhold | Swing | +5.1 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| DUP | Jeffrey Donaldson | 19,055 | 47.9 | −1.9 | |
| UUP | Alexander Redpath | 6,055 | 15.2 | −5.9 | |
| Alliance | Trevor Lunn | 5,544 | 13.9 | +2.5 | |
| SDLP | Pat Catney | 2,500 | 6.3 | +1.3 | |
| UKIP | Alan Love | 2,200 | 5.5 | New | |
| TUV | Samuel Morrison | 1,887 | 4.7 | −3.9 | |
| Sinn Féin | Jacqui McGeough | 1,144 | 2.9 | −1.1 | |
| Independent | Jonny Orr | 756 | 1.9 | New | |
| NI Conservatives | Helen Osborne | 654 | 1.6 | New | |
| Majority | 13,000 | 32.7 | +4.0 | ||
| Turnout | 39,795 | 55.9 | −0.1 | ||
| Registered electors | 71,152 | ||||
| DUPhold | Swing | +2.0 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| DUP | Jeffrey Donaldson | 18,199 | 49.8 | −8.5 | |
| UCU-NF | Daphne Trimble | 7,713 | 21.1 | −1.8 | |
| Alliance | Trevor Lunn | 4,174 | 11.4 | +0.5 | |
| TUV | Keith Harbinson | 3,154 | 8.6 | +8.6 | |
| SDLP | Brian Heading | 1,835 | 5.0 | −1.1 | |
| Sinn Féin | Paul Butler | 1,465 | 4.0 | −3.5 | |
| Majority | 10,486 | 28.7 | −4.5 | ||
| Turnout | 36,540 | 56.0 | −4.2 | ||
| Registered electors | 65,257 | ||||
| DUPhold | Swing | −3.4 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| DUP | Jeffrey Donaldson | 23,289 | 54.7 | +41.3 | |
| UUP | Basil McCrea | 9,172 | 21.5 | −35.0 | |
| Alliance | Seamus Close | 4,316 | 10.1 | −6.5 | |
| Sinn Féin | Paul Butler | 3,197 | 7.5 | +1.6 | |
| SDLP | Patricia Lewsley | 2,598 | 6.1 | −1.4 | |
| Majority | 14,117 | 33.2 | N/A | ||
| Turnout | 42,572 | 60.2 | −3.0 | ||
| Registered electors | 70,238 | ||||
| DUPgain fromUUP | Swing | +38.1 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | Jeffrey Donaldson | 25,966 | 56.5 | +1.1 | |
| Alliance | Seamus Close | 7,624 | 16.6 | −0.6 | |
| DUP | Edwin Poots | 6,164 | 13.4 | −0.2 | |
| SDLP | Patricia Lewsley | 3,462 | 7.5 | −0.3 | |
| Sinn Féin | Paul Butler | 2,725 | 5.9 | +3.4 | |
| Majority | 18,342 | 39.9 | −1.7 | ||
| Turnout | 45,941 | 63.2 | +1.1 | ||
| Registered electors | 72,671 | ||||
| UUPhold | Swing | +0.9 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | Jeffrey Donaldson | 24,560 | 55.4 | −5.4 | |
| Alliance | Seamus Close | 7,635 | 17.2 | +4.5 | |
| DUP | Edwin Poots | 6,005 | 13.6 | New | |
| SDLP | Dolores Kelly | 3,436 | 7.8 | −1.7 | |
| NI Conservatives | Stuart E. Sexton | 1,212 | 2.7 | −6.3 | |
| Sinn Féin | Sue Ramsey | 1,110 | 2.5 | +0.4 | |
| Workers' Party | Frances McCarthy | 203 | 0.5 | −0.7 | |
| Natural Law | Hugh Finlay | 149 | 0.3 | New | |
| Majority | 16,925 | 38.2 | −9.9 | ||
| Turnout | 44,310 | 62.1 | −5.2 | ||
| Registered electors | 71,341 | ||||
| UUPhold | Swing | −8.5 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | James Molyneaux | 29,772 | 60.8 | −9.2 | |
| Alliance | Seamus Close | 6,207 | 12.7 | −1.1 | |
| SDLP | Hugh Lewsley | 4,626 | 9.5 | +2.6 | |
| NI Conservatives | Timothy R. Coleridge | 4,423 | 9.0 | New | |
| Sinn Féin | Patrick Joseph Rice | 3,346 | 6.8 | +0.4 | |
| Workers' Party | Ann Marie Lowry | 582 | 1.2 | −1.7 | |
| Majority | 23,565 | 48.1 | −8.1 | ||
| Turnout | 48,956 | 67.3 | +2.9 | ||
| Registered electors | 72,645 | ||||
| UUPhold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | James Molyneaux | 29,101 | 70.0 | +10.8 | |
| Alliance | Seamus Close | 5,728 | 13.8 | +2.5 | |
| SDLP | Billy McDonnell | 2,888 | 6.9 | +0.5 | |
| Sinn Féin | Patrick Joseph Rice | 2,656 | 6.4 | +2.1 | |
| Workers' Party | John Lowry | 1,215 | 2.9 | +0.9 | |
| Majority | 23,373 | 56.2 | +13.8 | ||
| Turnout | 41,588 | 64.4 | −3.2 | ||
| Registered electors | 64,873 | ||||
| UUPhold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | James Molyneaux | 32,514 | 90.7 | +31.5 | |
| Workers' Party | John Lowry | 3,328 | 9.3 | +7.3 | |
| Majority | 29,186 | 81.4 | +39.0 | ||
| Turnout | 35,842 | 57.8 | −9.8 | ||
| Registered electors | 63,244 | ||||
| UUPhold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| UUP | James Molyneaux | 24,017 | 59.2 | ||
| DUP | William John Beattie | 6,801 | 16.8 | ||
| Alliance | Seamus Close | 4,593 | 11.3 | ||
| SDLP | Cormac Joseph Boomer | 2,603 | 6.4 | ||
| Sinn Féin | Richard McAuley | 1,751 | 4.3 | ||
| Workers' Party | Gerard Loughlin | 809 | 2.0 | ||
| Majority | 17,216 | 42.4 | |||
| Turnout | 40,574 | 67.6 | |||
| Registered electors | 60,051 | ||||
| UUPwin (new seat) | |||||