This is an estimate of the share of the vote that the principal parties would have won if, across Britain as a whole, voters had behaved in the same way as those who did vote in the wards that were contested by all three principal parties in this year’s English local elections. Electoral experts Professor Sir John Curtice and Professor Stephen Fisher explain it in more detail here.
Source link: https://www.bbc.co.uk/news/uk-politics-68926586