Opinion polling for the 2005 United Kingdom general election

In the run up to the general election of 2005, several polling organisations carried out opinion polling in regards to voting intention in Great Britain (i.e. the UK excluding Northern Ireland, which is usually excluded from such voting intention surveys). Results of such polls are displayed below.

The election took place on 5 May 2005. The previous general election was held on 7 Jun 2001.

Details of opinion polling

Since each MP is elected separately by the first past the post voting system, it is impossible to precisely project a clear election outcome from overall national shares of the vote. Not only can individual constituencies vary markedly from overall voting trends, but individual countries and regions within the nation may have a very different electoral contest that is not properly reflected in overall share of the vote figures.

Therefore, the first past the post system means that the number of MPs elected may not reflect the overall popular vote share across the parties. Thus, it is not necessarily the party with the largest share of the popular vote that ends up with the largest number of MPs. (See details of the elections in 1951 and Feb 1974) Since 1935 no party has achieved more than 50% of the popular vote in a British general election. The voting system favours parties with relatively concentrated support: a widely distributed vote leaves a party at risk of getting a large vote share but doing poorly in terms of numbers of seats (as the SDP-Liberal Alliance did in the 1980s), whereas parties with localised votes can win seats with a relatively small share of the vote.

That said, in previous elections, approximate forecasting of results were achieved by assuming that the swing in each individual constituency will be the same across the country. This system, known as uniform national swing (UNS) is used by much of the media in Britain to assess and extrapolate electoral fortunes from opinion poll data, though there has been criticism that such predictions may be naive and unreliable, even from providers of such data.[1]

Normally governments can easily survive for a full parliamentary term on a majority of more than 20 seats over all other parties. Below that level there is a danger of by-elections and MPs crossing the floor of the House reducing the government to a minority such that it would be at increased risk of losing a vote of no confidence.

Election battleground

The 2001 general election, which had the lowest turnout of any general election for more than 80 years, saw the Labour government of Tony Blair re-elected with a second successive landslide majority, which left the political landscape almost completely unchanged. William Hague resigned as leader of a Conservative opposition which failed to make any real progress from its heavy defeat in 1997, and was succeeded by Iain Duncan Smith.

The Labour government remained ascendant in the opinion polls, but its popularity began to suffer from Mar 2003 as a result of Tony Blair's decision to send British forces to collaborate with the American forces in their invasion of Iraq, which led to the end of Saddam Hussein's dictatorship, as well as his eventual capture, trial and execution by a new democratic Iraqi government. However, there was a public outcry that the invasion of Iraq failed to uncover weapons of mass destruction which had long been believed to exist in Iraq. By the summer of 2003, several opinion polls were showing a narrow Conservative lead, and the Liberal Democrats were also shown to be enjoying a surge in support, largely seen to be the result of Charles Kennedy's anti-war stance.

However, opinion polls showed that Iain Duncan Smith was not a popular choice with voters as a potential prime minister, and there was also the fact that Labour still had a huge parliamentary majority, while the Tories would have to almost double their share of seats in parliament to form a majority. Duncan Smith was ousted as leader in Nov 2003 following a vote of no confidence by his own party, was succeeded uncontested by the former Home Secretary Michael Howard, who helped the Tories keep close behind Labour in the opinion polls and oversaw strong showings in the local council and European parliament by-elections of 2004.

A general election was called for 5 May 2005, with Labour winning for a third successive time, but its majority dropped from 160 seats to 66 seats, with both the Conservatives and Liberal Democrats enjoying substantial gains.

Tony Blair had already decided that the 2005 general election would be the last he would contest as Labour Party leader if re-election was achieved. Michael Howard announced his resignation shortly afterwards, feeling that he was too old to lead the party into the next general election (knowing that it was unlikely to be held until he was almost 70 years old), and Charles Kennedy stepped down eight months later following revelations about his personal life.

Graphical summary

Poll results

Poll results are initially listed in reverse chronological order showing the most recent first, using the date the fieldwork was undertaken, as opposed to the date of publication.

The figure given in the 'lead' column is the lead held by Labour or the Conservatives over the second placed of the two parties.


Pollster Client Dates
Lab Con Lib Dem Others Lead
2005 general election 5 May 36.2%33.2%22.7%7.9%3.0%
Ipsos MORI Evening Standard 3–4 May1,16438%33%23%6%5%
Populus The Times 2–3 May117438%32%21%8%6%
ICM The Guardian 1–3 May1,17838%32%22%8%6%
Populus The Times 29 Apr – 2 May86641%27%23%9%14%
Populus The Times 27–30 Apr86342%29%21%8%13%
Populus The Times 25–28 Apr85340%31%22%7%9%
Populus The Times 24–27 Apr84140%31%21%8%9%
ICM The Guardian 24–26 Apr1,20940%32%21%5%8%
Populus The Times 23–26 Apr83540%31%21%8%9%
Populus The Times 22–25 Apr83140%31%21%8%9%
Populus The Times 21–24 Apr81941%33%19%7%8%
Populus The Times 20–23 Apr79841%32%20%7%9%
Populus Online The Times Online 19–22 Apr79841%33%20%6%8%
Populus The Times 18–21 Apr80640%33%20%7%7%
Populus The Times 17–20 Apr83639%34%20%7%5%
ICM The Guardian 17–19 Apr1,16339%33%22%7%6%
Populus The Times 16–19 Apr86339%33%21%7%6%
Populus The Times 14–17 Apr58640%31%21%8%9%
ICM The Guardian 10–12 Apr1,16939%33%22%7%6%
ICM The Guardian 1–3 Apr97337%34%21%8%3%
Populus The Times 1–3 Apr81237%35%19%9%2%
ICM The Guardian 18–20 Mar71640%32%20%7%8%
Populus The Times 4–6 Mar83139%32%20%9%7%
ICM The Guardian 18–20 Feb1,013[2]37%34%21%8%3%
Populus The Times 4–6 Feb81441%32%18%9%9%
ICM The Guardian 21–23 Jan1,000[2]38%31%21%9%6%
Populus The Times 7–9 Jan84838%33%20%9%5%


Pollster Client Dates
Lab Con Lib Dem Others Lead
ICM The Guardian 16–19 Dec1,002[2]40%31%21%7%8%
Populus The Times 3–5 Dec82637%33%20%10%4%
ICM The Guardian 12–14 Nov83038%30%22%10%8%
ICM The Guardian 22–24 Oct1,01137%31%23%9%6%
YouGov The Daily Telegraph 21–23 Sep203336%34%21%9%2%
ICM The Guardian 17–19 Sep1,00536%32%22%10%4%
Populus The Times 2–5 Sep60831%30%26%13%1%
ICM The Guardian 13–15 Aug1,00536%33%22%9%3%
Populus The Times 30 Jul – 1 Aug57032%32%24%12%Tie
ICM The Guardian 16–18 Jul1,00735%30%25%10%5%
Populus The Times 2–3 Jul55633%29%24%14%4%
Ipsos MORI Financial Times 18–20 Jun96632%27%22%19%6%
ICM The Guardian 11–13 Jun1,00934%31%22%13%3%
10 Jun 2004 European election
Populus The Times 4–6 Jun58931%29%22%18%3%
ICM The Guardian 20–23 May1,00139%34%20%7%5%
Populus The Times 7–9 May57832%36%22%10%4%
ICM The Guardian 16–18 Apr1,00238%33%22%6%5%
ICM The Guardian 10–11 Mar1,01437%35%21%7%2%
Populus The Times 5–7 Mar57336%34%22%8%2%
ICM The Guardian 20–22 Feb1,00636%34%21%8%2%
Populus The Times 6–8 Feb58036%31%25%8%5%
ICM The Guardian 16–18 Jan1,00739%34%20%7%5%
Populus The Times 2–4 Jan56640%35%18%7%5%


Pollster Client Dates
Lab Con Lib Dem Others Lead
ICM[3] The Guardian 12–14 Dec1,00138%33%21%8%5%
Populus The Times 5–7 Dec55735%33%22%10%2%
ICM[3] The Guardian 14–16 Nov1,00238%33%21%8%5%
Populus The Times 7–9 Nov55435%31%24%10%4%
6 Nov Michael Howard elected Conservative Party leader
ICM[3] The Guardian 17–19 Oct1,00438%33%21%8%5%
Populus The Times 3–5 Oct52436%28%27%9%8%
YouGov The Daily Telegraph 23–25 Sep230631%32%30%7%1%
ICM The Guardian 19–21 Sep1,00235%30%28%8%5%
Populus The Times 5–6 Sep51137%35%20%8%2%
ICM The Guardian 15–17 Aug1,00137%32%22%9%5%
Populus The Times 1–3 Aug56435%33%25%7%2%
YouGov The Daily Telegraph 22–24 Jul221934%37%22%7%3%
ICM The Guardian 18–20 Jul1,00336%34%22%9%2%
ICM The Guardian 20–22 Jun1,00138%34%21%7%4%
Populus The Times 13–15 Jun51336%34%21%9%2%
ICM The Guardian 16–18 May1,00042%29%21%8%13%
Populus The Times 2–4 Mar56535%34%23%8%1%
YouGov The Daily Telegraph 22–24 Apr239040%32%21%7%8%
ICM The Guardian 17–19 Apr1,00042%30%21%7%12%
YouGov The Daily Telegraph 26–27 Mar228240%33%20%7%7%
Populus The Times 10–12 Mar54042%29%22%7%13%
ICM The Guardian 14–16 Mar1,00238%32%24%6%6%
Populus The Times 7–9 Mar49834%34%24%8%Tie
ICM The Guardian 14–16 Feb1,00339%31%22%8%8%
Populus The Times 7–9 Feb55535%34%25%6%1%
YouGov The Daily Telegraph 28–30 Jan194936%32%24%8%4%
ICM The Guardian 17–19 Jan1,00243%30%21%6%13%
Populus The Times 3–5 Jan56538%31%25%6%7%


Pollster Client Dates
Lab Con Lib Dem Others Lead
ICM The Guardian 13–15 Dec1,00641%27%23%8%14%
ICM The Guardian 15–17 Nov1,00042%29%22%7%13%
ICM The Guardian 18–20 Oct1,00143%32%20%6%11%
Populus The Times 11–13 Oct1,00142%30%21%6%12%
ICM The Guardian 20–22 Sep1,00039%34%20%7%5%
Populus The Times 5–7 Sep61039%33%21%6%6%
ICM The Guardian 23–25 Aug1,00341%32%21%6%9%
ICM The Guardian 26–27 Jul1,00242%33%20%4%9%
ICM The Guardian 21–23 Jun1,00242%32%20%7%10%
ICM The Guardian 17–19 May1,00342%34%19%5%8%
ICM The Guardian 20–21 Apr1,00045%29%18%8%16%
ICM The Guardian 15–17 Mar1,00143%34%17%6%9%
ICM The Guardian 15–17 Feb1,00347%30%18%5%17%
ICM The Guardian 18–20 Jan1,00345%30%19%6%15%


Pollster Client Dates
Lab Con Lib Dem Others Lead
ICM The Guardian 14–16 Dec1,00044%29%20%7%15%
ICM The Guardian 16–18 Nov1,00446%29%19%6%17%
ICM The Guardian 19–20 Oct1,00047%29%19%5%18%
ICM The Guardian 14–16 Sep1,00746%29%20%5%17%
ICM The Guardian 17–19 Aug1,00446%30%17%7%16%
ICM The Guardian 13–14 Jul1,00146%30%18%6%16%
Ipsos MORI The Sunday Telegraph 31 May – 1 Jun1,02150%27%17%6%23%
2001 general election 7 Jun42.0%32.7%18.8%6.5%9.3%


  1. Predicting Results UK Polling Report
  2. The number of responses used to calculate the voting intention was not provided; the total number of participants in the poll is therefore listed.
  3. The responses to the questions on voting intention are not included in this document; they have therefore instead been taken from Guardian/ICM polls: every one since 1984.