Political defections, commonly known in Westminster parlance as ‘Crossing the Floor’, have been a phenomenon in Parliament since at least the 17^th century. This has either happened en masse, as part of major schisms within pre-existing parties (such as the establishment of the Liberal Unionists in the late 19^th century, or the Social Democratic Party in 1981 and The Independent Group/Change UK in 2019), or on an individual level, motivated either by political issues of national significance, or as a result of local contexts. In the History of Parliament’s Oral History archive, multiple former MPs have recounted their decision to ‘cross the floor’ and change party affiliation. These were frequently extremely difficult decisions, often at huge personal cost, in some instances causing the end of long-term friendships or associations. They also frequently reflected major changes in British politics happening well beyond their immediate experiences.

Some MPs took the difficult decision to leave their party because of local issues, typically involving conflicts with their constituency parties. In 1973, Dick Taverne, the moderate Labour MP for Lincoln (1962-74), resigned the whip after his local party deselected him due to his pro-European views, particularly for voting in favour of the UK joining the European Economic Community (EEC).

Taverne would subsequently resign his seat to trigger a by-election, which he won under the ‘Democratic Labour’ label. It was the first time a candidate other than the Conservatives, Labour or the Liberals had won an English by-election in the post-war era. While Taverne’s parliamentary career after Labour was brief (he was defeated at the October 1974 general election by Labour’s Margaret Beckett), it anticipated later political events, most notably the defection of Labour’s ‘Gang of Four’ and the establishment of the Social Democratic Party (SDP) in 1981. Taverne himself would join the SDP, and later stand again for Parliament (in Dulwich, unsuccessfully) in 1983, before becoming a Liberal Democrat peer in 1996. In 1977, Reg Prentice (Newham North-East, formerly East Ham North, 1957-79; Daventry, 1979-87) left the Labour Party due to similar local conflicts, but took the far more controversial decision of defecting directly to the Conservatives. He would later change constituencies and serve as a minister in Margaret Thatcher’s first government. Once again, Prentice’s defection partly showcased the various political divisions emerging within the Labour Party at the end of the 1970s.

Other defections were directly motivated by national political issues. In 1976, Scottish MPs Jim Sillars (South Ayrshire, 1970-79; Glasgow Govan, 1988-92) and John Robertson (Paisley, 1961-79) both resigned from Labour to set-up the ‘Scottish Labour Party’ (SLP). They were motivated by the issue of devolution, and frustration with the failure of the incumbent Labour government to establish a devolved Scottish Assembly with substantial economic powers.

While Sillars never regretted his decision to leave Labour and set up the SLP, he did admit that it was a ‘rush to the head’ and not fully thought through.  

Nevertheless, though the SLP ultimately enjoyed little electoral success, and was dissolved by 1981, Sillars and Robertson’s defections reflected the growing influence of Scottish nationalism in British politics, and anticipated the left-wing, pro-European form it would take in the following decades. In 1988 Sillars was returned to Parliament following a by-election in Glasgow Govan, this time standing as a candidate for the Scottish National Party (SNP), on a platform designed to outflank Labour from the left

Like other defections, Nicholson’s departure from the Conservatives reflected wider developments, but was also of notable personal significance, being the member of a very prominent Conservative family.  

Our interviews with both Sillars and Nicholson emphasise the emotional cost of leaving their parties. Party membership is more than a collection of people with shared political outlook; very deep relationships are made and it can be a key part of a politician’s identity.  For Sillars, leaving the Labour Party was ‘like a Catholic leaving the church […] it’s a tremendous trauma, personal trauma’ and the pressure really affected his health (he developed ulcers), his family and marriage. Nicholson described being ‘extremely angry’ with the Conservatives before she left. In part her defection was her response to feeling ‘bullied’ by the whips and a determination to resist that behaviour. Yet it was a decision she reached ‘very sadly, because I am intrinsically a Conservative.’

One of the most unusual political defections recounted in our project was that of Andrew Hunter. Having sat as the Conservative MP for Basingstoke since 1983, Hunter resigned the party whip in 2002, before joining the Northern Irish Democratic Unionist Party (DUP) in 2004. This was the first time an MP for a mainland British constituency represented a Northern Irish party since T.P. O’Connor, the Irish Nationalist MP for Liverpool Scotland (1885-1929). Hunter’s decision was motivated by conflicts with the Tory leader Iain Duncan Smith, particularly over the party’s controversial links to the right-wing Monday Club (which Hunter supported), disillusionment with the Westminster system, and a desire to pursue a political career in Northern Ireland, owing to his long-standing connections to the DUP and wider unionist community, particularly the Orange Order.  

Unsurprisingly, many of these defections sparked outrage among their former colleagues. Sillars would describe the ‘vicious’ reaction he received, while others would describe being accused of opportunism, cowardice or treason. In some instances, the defectors’ new political allies were not always entirely welcoming either. Interestingly, in many cases these defections were explained as not due to any significant change in the views of the MPs themselves, but out of discontent with their former party’s trajectory. Versions of the phrase ‘I didn’t leave the party, the party left me’ was commonly used by Labour defectors to the SDP in the 1980s, as well as by Emma Nicholson in 1995. Indeed, while some of these defections proved permanent, such as in the case of the SDP or Sillars, others were ultimately temporary. In 2016, Emma Nicholson rejoined the Conservative Party ‘with tremendous pleasure’ (BBC News, 10 September 2016), while more recently, Luciana Berger, who left Labour to form The Independent Group/Change UK in 2019 and later joined the Lib Dems, now sits in the Lords as a Labour peer. Both instances suggest that while defections have often been dramatic and bitterly divisive, reconciliation has also occasionally been possible.

Ultimately, stories from our Oral History Project reveal that political defections are often highly personal decisions and experiences, but can also reflect wider political developments, and even play a role in shaping subsequent events.

A.S. & E.P.

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Further Reading

Andy Beckett, ‘Emma Nicholson: Not her sort of party’, Independent, 31 December 1995.

Tom Chidwick, ‘“Return Taverne”: 50 years on from the Lincoln by-election’, Mile End Institute blog, 1 March 2023

Ivor Crewe and Anthony King, SDP: The Birth, Life and Death of the Social Democratic Party (Oxford: Oxford University Press, 1995).

Geoff Horn, Crossing the Floor: Reg Prentice and the Crisis of British Social Democracy (Manchester: Manchester University Press, 2016).

Ben Jackson, ‘From British Labourism to Scottish Nationalism: Jim Sillars’ Journey’, Scottish Affairs 31:2 (2022), pp.233-239.

Rebecca McKee and Jack Pannell, ‘MPs who change party allegiance’, Institute for Government blog, 12 March 2024.

Emma Peplow and Priscilla Pivatto, The Political Lives of Postwar MPs (London: Bloomsbury, 2020).

When Britain was applying to join the then European Economic Community (EEC) in the 1960s and 1970s it was the Labour party who were divided on the issue and had a significant minority opposed to membership. In 1971 the Conservative leader Ted Heath put the question of entry to the EEC to the Commons, and Labour MPs were instructed to vote against. This caused real issues for a number of Labour MPs, mostly on the right of the party, who were pro-European. Amongst these were some of the MPs who later formed to the Social Democrat Party in the 1980s.

Dick Taverne, MP for Lincoln, would later join the SDP, but he left the Labour party much earlier. As a committed pro-European he rebelled against the party leadership and voted for joining the EEC, and in doing so lost the support of his constituency party. In his recent interview for our oral history project, he discussed how he left the Labour party and forced a by-election, standing as an independent social democrat candidate:

And my local party was absolutely clear about it and they said: ‘If you vote for entry against the three line whip we will withdraw support’. So I did. And they did. A big battle ensued, in fact it became a national battle, because there was a Granada World in Action programme which televised a debate in which I confronted the leader of my local party, Leo Beckett, and some of his followers. In which they said ‘Didn’t we support you? Weren’t we on the door step with you?’ and I said ‘Yes you were and of course I take note of your opinions but I am not a puppet. I don’t vote as I am instructed by my party masters and I am going to vote for entry’. (You can listen to this clip, and more, on our website)

The 1973 Lincoln by-election put both local party activists and Taverne’s fellow-MPs who sympathised with his stand, but did not want to force the issue with the party, in a difficult position. He remembered that “one third of my local party joined me, which was very brave because they worked for the party all their lives, they were due to be expelled.” However, support from fellow-MPs, even quietly, was very difficult: “I got nudges of support, they’d hope I do well. I mean Roy was absolutely delighted when I won – Roy Jenkins – but he couldn’t possibly.”

Despite winning the by-election, Taverne continued to face difficulties on his return to the House of Commons. In the following extract, he remembers being viewed as a ‘traitor’ to his party, and losing that support:

Taverne won the following general election but lost his seat in October 1974. He wrote a book calling for a third, centrist party in British politics and when the SDP was formed in the 1980s he joined, now sitting in the Lords as a Liberal Democrat peer. Whilst the Clacton by-election is in very different circumstances, the vexed issue of British membership of Europe remains.

EP