Check the latest opinion poll trends with the poll tracker, which measures how people say they are going to vote at the next general election.
Analysis by BBC senior political analyst Peter Barnes
As our poll tracker graph shows, after a year and a half of only gradual movement, the period since February has been pretty tumultuous – perhaps reflecting what has been going on in politics.
The creation of the new Change UK Party – since renamed The Independent Group for Change (or TIGfC in our chart) – and then The Brexit Party had a major impact.
Added to this has been a sustained increase in support for the Liberal Democrats and a clear boost for the Conservatives after Boris Johnson replaced Theresa May as prime minister