In the twentieth century, the constituency was held by the Conservative Party for most of the time. However, Aidan Crawley, a Labour Party MP, served Buckingham from 1945 until 1951, and from 1964 until 1970, its Labour MP was the controversial publisher Robert Maxwell.
Before the periodic review effected in 1983, the new town of Milton Keynes, including its older parts such as Bletchley and Fenny Stratford,[n 3] was in the constituency. The 1983 review followed the previous national review in 1974 and recognised the large increase in voters in the constituency. The sitting Buckingham MP, William Benyon, stood for the newly created Milton Keynes constituency, where he was elected. The residual seat was won in 1983 by Conservative George Walden. Walden retired in 1997, and John Bercow won the following general elections in 2001, 2005, 2010, 2015 and 2017. At the 2005 general election, this constituency had the Conservatives' highest numerical majority, although a higher share of the vote was achieved in Kensington and Chelsea in London, the constituency of Malcolm Rifkind, and Richmond in North Yorkshire, the constituency of William Hague.
In 2009, Bercow was elected as Speaker of the House of Commons following the resignation of Michael Martin. There is an inconsistently followed convention, which is mostly kept by the major parties, not to oppose a Speaker at election. Nonetheless, UKIP's leader, Nigel Farage, stood against Bercow in the 2010 election but finished third behind the Buckinghamshire Campaign for Democracy founder, who previously founded the Pro-Euro Conservative Party.[4]
In both the 2015 and 2017 general elections, Bercow was challenged by only UKIP and the Green Party, with the addition of the independent candidate Scott Raven in the latter election. In September 2019 the Conservative Party announced their intention to stand a candidate against Bercow in the next election, breaking the convention of major parties not opposing a Speaker, seemingly in response to Bercow's opposition to Prime MinisterBoris Johnson's handling of Brexit. However, Bercow announced in September 2019 that he would stand down as Speaker on either October 31 or at the next election, whichever occurred first.[5]
The Urban Districts of Bletchley, Linslade, Newport Pagnell, and Wolverton; and
The Rural Districts of Buckingham, Newport Pagnell, Wing, and Winslow.[7]
The Urban District of Wolverton had succeeded the Rural District of Stratford and Wolverton. The parts of the Rural District of Aylesbury and the (former) Rural District of Long Crendon were transferred to Aylesbury.
The District of Aylesbury Vale wards of Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Eddlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Hogshaw, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Oakley, Pitstone, Quainton, Steeple Claydon, Stewkley, Stone, Tingewick, Waddesdon, Wing, Wingrave, and Winslow; and
The Borough of Milton Keynes wards of Stony Stratford, Wolverton, and Wolverton Stacey Bushes.[8]
Rural areas to the north and west of the town of Aylesbury transferred from the constituency thereof. The area comprising the new District of Milton Keynes, except for Stony Stratford and Wolverton, formed the new constituency of Milton Keynes.
For the 1992 general election, outside the normal cycle of periodic reviews by the Boundaries Commission, the Milton Keynes constituency was split in two, with Stony Stratford and Wolverton being included in the new Borough Constituency of Milton Keynes South West.[9] No further changes.
The District of Aylesbury Vale wards of Aston Clinton, Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Eddlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Hogshaw, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Oakley, Pitstone, Quainton, Steeple Claydon, Stewkley, Stone, Tingewick, Waddesdon, Wing, Wingrave, and Winslow.[10]
The Aston Clinton ward was transferred from Aylesbury.
The District of Aylesbury Vale wards of Buckingham North, Buckingham South, Eddlesborough, Gatehouse, Great Brickhill & Newton Longville, Great Horwood, Grendon Underwood & Brill, Haddenham & Stone, Long Crendon, Luffield Abbey, Marsh Gibbon, Oakfield & Bierton, Oakley, Pitstone & Cheddington, Quainton, Steeple Claydon, Stewkley, Tingewick, Waddesdon, Watermead, Weedon, Wing, Wingrave, and Winslow; and
The District of Wycombe wards of Icknield and The Risboroughs.[11]
The District of Wycombe wards, including Princes Risborough, were transferred from Aylesbury, offset by the return of Aston Clinton.
In April 2020, the Districts of Aylesbury Vale and Wycombe, as well as those of South Bucks and Chiltern were merged into the new unitary authority of Buckinghamshire Council. Accordingly, the current contents of the constituency are:
The Buckinghamshire Council wards of Aston Clinton and Bierton (part), Bernwood, Buckingham East, Buckingham West, Great Brickhill, Grendon Underwood, Ivinghoe, Ridgeway East (part), Stone and Waddesdon (part), The Risboroughs, Wing (part), and Winslow.
^Great Britain, Incorporated Council of Law Reporting for England and Wales. The public general acts. unknown library. Proprietors of the Law Journal Reports, 1884.
^ abcS., Craig, Fred W. (1972). Boundaries of parliamentary constituencies 1885-1972;. Chichester: Political Reference Publications. ISBN0900178094. OCLC539011.{{cite book}}: CS1 maint: multiple names: authors list (link)