The charts on AllPolls.co.uk show how each party's or coalition's vote share has moved over time. The vertical axis shows the share of the vote. On timeline charts the horizontal axis is the date; on comparison charts it is the number of days to election day, counting down from 91 to 0, so the final stretch of several campaigns can be seen side by side — older elections are shown more faded (transparent) than the most recent one. Where available, the official general election result is shown at the far right.
The charts are interactive:
- Zooming in: on timeline charts you can zoom in: use the slider (dataZoom) below the chart, scroll with the mouse wheel over the chart, or drag to shift the visible window. Comparison and exit poll charts have no zoom; their range is fixed.
- Viewing values: move your mouse over the chart (hover) to see a vertical guide line with a tooltip listing every pollster at that point, with its exact value. Individual polls show whole percentage points; where the line is drawn between two polls, the interpolated value is shown with one decimal, e.g. 2.3.
- Showing or hiding pollsters: click a name in the legend to temporarily show or hide that pollster in the chart. When many pollsters or parties are shown at once, you can scroll through the legend.
- Names next to the line: with twenty or fewer pollsters or parties in one chart, the name is shown directly at the right-hand end of each line, so you can identify a pollster without the legend.
- Records: a pin marks the highest or lowest figure a party or coalition has ever reached, or within a given period (for example the last 5 or 10 years). When viewing a single pollster's chart, the tooltip notes "according to {pollster}" — such a record only applies to that pollster, not the all-pollster average.
- Downloading: click the camera icon in the top-right of the chart to download it as an image (PNG).
If a pollster hasn't published for a long time — for example because they paused fieldwork for a period — that pollster's line is broken rather than stretched to the next available point, so the chart doesn't give a distorted impression.
Below every chart is a table with the same figures in text form: useful as an alternative overview, and as a fallback when the interactive chart itself can't load.