was formed under the Redistribution of Seats Act 1885 as the Southern or Henley Division of Oxfordshire when the three-member Parliamentary County of Oxfordshire was divided into the three single-member constituencies of Banbury, Woodstock and Henley. It comprised the Municipal Borough of Henley-on-Thames, the Sessional Divisions of Henley and Wallington, part of the Sessional Division of Bullingdon and the part of the Municipal Borough of Abingdon in the county of Oxfordshire. 1918–1950: The Municipal Borough of Henley-on-Thames, the Urban Districts of Bicester, Thame, Wheatley, as well as the Rural Districts of Bicester, Crowmarsh, Culham, Goring, Headington, Henley, Thame. Expanded to include eastern half of the abolished Woodstock Division, including Bicester. Caversham, which had been absorbed by the County Borough of Reading, transferred to the Parliamentary Borough of Reading in Berkshire. 1950–1974: The Municipal Borough of Henley-on-Thames, the Urban Districts of Bicester and Thame, the Rural Districts of Bullingdon and Henley and part of the Rural District of Ploughley. Change to contents due to reorganisation of urban and rural districts. Minor losses to the Oxford constituency, including Cowley and Headington, as a result of the expansion of the County Borough of Oxford. 1974–1983: The Municipal Borough of Henley-on-Thames, the Urban District of Thame, the Rural District of Henley and part of the Rural District of Bullingdon. Bicester and northern parts of Rural District of Ploughley transferred to Banbury. Southern parts of the Rural District of Ploughley and northernmost parts of the Rural District of Bullingdon included in the new County Constituency of Mid-Oxon. 1983–1997: The District of South Oxfordshire wards of Aston Rowant, Benson, Berinsfield, Chalgrove, Chinnor, Clifton Hampden, Crowmarsh, Dorchester, Forest Hill, Garsington, Goring, Goring Heath, Great Milton, Henley, Kidmore End, Nettlebed, Rotherfield Peppard, Shiplake, Sonning Common, Thame North, Thame South, Watlington, Wheatley, and Woodcote. Gained the rural area to the east of Oxford from the abolished County Constituency of Mid-Oxon. The Littlemore ward to the south of Oxford was included in the new Borough Constituency of Oxford East. 1997–2010: As above plus Horspath. Minor gain from Oxford East. 2010–present: The District of South Oxfordshire wards of Aston Rowant, Benson, Berinsfield, Chalgrove, Chilton Woods, Chinnor, Clifton Hampden, Crowmarsh, Forest Hill, Garsington, Goring, Great Milton, Henley North, Henley South, Kidmore End, Nettlebed, Rotherfield Peppard, Shiplake, Sonning Common, Thame North, Thame South, Watlington, Wheatley, and Woodcote, and two District of Cherwell wards of Fringford & Heyfords and Launton & Otmoor. The two