The constituency was created as a consequence of the Redistribution of Seats Act 1885. The Act reduced the number of MPs.in Dorset from 10 to 4. It was initially proposed to name the new constituencies after existing boroughs but, following an amendment in the Commons on 14 April 1885, the names were changed to the points of the compass. The South Dorset constituency was divided into 7 polling districts. Dorchester was chosen as the place where the nomination of candidates would take place and the result would be declared. The area covered was:
In the 1997 election the seat was won by Ian Bruce by a margin of only 77 votes, one of the smallest margins in the UK. The 2001 election saw the second Labour win in South Dorset's history with Labour's smallest majority in England, at 153. In the 2005 election this constituency was one of the few in which Labour significantly increased their majority. Conservative candidate Ed Matts was found to have doctored an image which was part of his campaign material. Matts changed a photo of a protest against the deportation of a South Dorset resident, so that it appeared to be a protest against "uncontrolled immigration". In both elections, the left-wing singer-songwriter Billy Bragg led an anti-Conservative tactical voting campaign in Dorset constituencies. The 2010 election saw Conservative Richard Drax, a former soldier and journalist from a long line of Dorset representatives, defeating the incumbent Jim Knight, who ended his final year in parliament as the Minister for Employment and Welfare Reform. Richard Drax retained the seat in 2015 election with an increased majority.
Boundaries
1885–1918: The Municipal Boroughs of Dorchester, and Weymouth and Melcombe Regis, and parts of the Sessional Divisions of Dorchester and Wareham. 1918–1950: The Municipal Boroughs of Wareham, and Weymouth and Melcombe Regis, the Urban Districts of Portland and Swanage, the Rural District of Wareham and Purbeck, and the part of the Rural District of Weymouth that was not included in the Dorset West constituency. 1950–1983: The Municipal Boroughs of Wareham, and Weymouth and Melcombe Regis, the Urban Districts of Portland and Swanage, the Rural District of Wareham and Purbeck, and in the Rural District of Dorchester the civil parishes of Bincombe, Chickerell, Fleet, Osmington, Owermoigne, and Poxwell. 1983–1997: The Borough of Weymouth and Portland, the District of Purbeck wards of Bere Regis, Castle, Langton, St Martin, Swanage North, Swanage South, Wareham, West Purbeck, Winfrith, and Wool, and the District of West Dorset ward of Owermoigne. 1997–2010: The Borough of Weymouth and Portland, the District of Purbeck wards of Castle, Langton, Swanage North, Swanage South, West Purbeck, Winfrith, and Wool, and the District of West Dorset ward of Owermoigne. 2010–present: The Borough of Weymouth and Portland, the District of Purbeck wards of Castle, Creech Barrow, Langton, Swanage North, Swanage South, West Purbeck, Winfrith, and Wool, and the District of West Dorset ward of Owermoigne.
Constituency profile
The seat includes the coastal areas to the south of the county of Dorset, plus some rural Purbeck territory further inland. The port of Weymouth is one of the few large towns in Dorset and its suburbs extend onto the Wyke Regis peninsula and the isle of Portland, connected to the mainland by road. The constituency includes Bovington army camp, and further east, Corfe Castle, connected by the preserved Swanage Railwaysteam railway to the holiday resort of Swanage. This part of the seat is closer to Poole and Bournemouth than to Weymouth. Workless claimants were in November 2012 significantly lower than the national average of 3.8%, at 2.8% of the population based on a statistical compilation by The Guardian.
General Election 1939/40: Another general election was required to take place before the end of 1940. The political parties had been making preparations for an election to take place from 1939 and by the end of this year, the following candidates had been selected;
