The constituency was created for the 1950 general election, when the previous two-member Southampton constituency was abolished. The boundaries of the seat have changed at most of the Boundary Commissions' periodic reviews.
Horace King, the MP between 1950 and 1955, before switching to the neighbouring seat of Southampton Itchen, would later become the first Speaker of the House of Commons from the Labour Party. The seat was contested unsuccessfully in 1955 and 1959 respectively by Anthony Crosland and Shirley Williams, who would both later be elected for other seats and become prominent ministers in the Labour governments of the 1960s and 1970s.
Southampton Test proved to be a bellwether (mirroring the national result) from 1966 until 2010, with the exception of the minority government of Harold Wilson from February to October 1974 .
In the 2010 general election, Alan Whitehead for Labour performed better here than John Denham in Southampton Itchen, the other Southampton seat, which the party also held more narrowly that year. The area from 2010 to 2015 was one of four Labour seats in South East England and from 2017 to 2019 among two of eighteen in Hampshire won by Labour candidates. Whitehead was re-elected in 2017 with a majority of over 10,000 votes, and in 2019 over 6,000, making Southampton Test a relatively comfortable Labour seat. Whitehead did not stand at the 2024 general election; he was succeeded by fellow Labour Party member, Satvir Kaur, with a majority of over 9,000.
Constituency profile
The seat covers the western part of the City of Southampton and is named after the River Test, one of the city's two rivers. It covers some of the leafy northern suburbs (though the northernmost Bassett Ward ceased to form part of the constituency in 1997) and the western port areas as well as the social housing estates of the western fringes. It is traditionally the marginally more affluent of the two constituencies in the city, before 2010 having a higher number of Tory representatives than its neighbour Southampton Itchen – named after the other major river. The area includes the University of Southampton, though its halls of residence fall almost entirely within Romsey and Southampton North or Southampton Itchen.
The seat is home to Southampton's football ground at St Mary's.
Boundaries
Historic
1950–1955: The County Borough of Southampton wards of All Saints, Banister, Freemantle, Millbrook, St Nicholas, Shirley, and Town; and the (civil) Parish of Millbrook (which was then in the Romsey and Stockbridge Rural District).
1955–1983: The County Borough of Southampton wards of Banister, Bargate, Bassett, Coxford, Freemantle, Millbrook, Portswood, Redbridge, and Shirley.
1983–1997: The City of Southampton wards of Bassett, Coxford, Freemantle, Millbrook, Portswood, Redbridge, and Shirley.
1997–2010: The City of Southampton wards of Coxford, Freemantle, Millbrook, Portswood, Redbridge, St Luke's, and Shirley.
2010–2023 The City of Southampton wards of Bevois, Coxford, Freemantle, Millbrook, Portswood, Redbridge, and Shirley.
Current
Following a review of local authority ward boundaries, which became effective in May 2023, the constituency now comprises the following:
The City of Southampton wards of: Banister & Polygon (majority); Bevois; Coxford; Freemantle; Millbrook; Portswood; Redbridge; Shirley; Swaythling (small part).
