Source: Ipsos Political Monitor Base: Base: 1,137 British adults 18+, 13-20 May 2026 ; Headline Voting Intention: all 9/10 certain to vote, always/usually/it depends vote in General Elections = 816. Margin of error is displayed at +/- 4% All polls are subject to a wide range of potential sources of error. On the basis of the historical record of the polls at recent general elections, there is a 9 in 10 chance that the true value of a party’s support lies within 4 points of the estimates provided by this poll, and a 2 in 3 chance that they lie within 2 points. This is especially important to keep in mind when calculating party lead figures.