To obtain a range of surveys appropriate to our averages, we use those conducted by members of the British Polling Council., external
Its members agree to the same rules on transparency, but the council said membership should not be seen as a guarantee of quality.
The polls we include are from BMG, Deltapoll, Electoral Calculus, Find Out Now, Focaldata, Ipsos, JL Partners, More in Common, Opinium, Norstat (formerly Panelbase), People Polling, Redfield and Wilton Strategies, Savanta, Survation, Techne . , Verian (formerly Kantar Public), WeThink (formerly Omnisis), Whitestone Insight and YouGov.
We only include voting intention percentages, which pollsters calculate by excluding or otherwise adjusting for people who responded “don’t know” or “won’t vote.”
Most polls cover Britain, although some survey the whole country. Respondents are not given the option to choose parties that run only in Northern Ireland.
We include data that is in the public domain. Some polling companies will not publish all data from all parties at once.
