The myth of internal political polling

As ever, let's kick off with the national voting intention picture, with five pollsters having polls out with fieldwork in the last week. It's a familiar picture: Labour ahead on 39-42%, Conservatives on 32-34% (which compares with 33% for Jeremy Corbyn's Labour in 2019 or 31% for John Major's Conservatives in 1997), the Lib Dems on a much wider range t…