With the end of another, rather interesting, quarter, another update to PollBase, my database of British voting intention opinion polls since 1943 is now up.
This time, as well as another quarter of polls, the update includes additional voting intention and leader rating data from Deltapoll from the last Parliament and this. Thank you to the firm for providing two handy historical spreadsheets to fill in gaps.
P.S. For the very latest polls, see my polling scorecard and for the history of polls, how to spot the good from the bad and what the future holds for opinion polling, see my book, Polling UnPacked: the history, uses and abuses of political opinion polls.