We know that, as a matter of editorial policy, the BBC doesn’t run opinion polls commissioned elsewhere as news stories in their own right (except for the odd exception). It never occurred to me, though, that its problem with them was that they could be too accurate. This could be the case, if the ComRes polls for the Daily Politics programme are anything to go by, however. Political Betting has the story, but here’s the key passage:
For the Daily Politics polls have one fundamental difference compared with the standard ComRes voting intention surveys – there’s no effort to ensure a politically balanced sample which almost inevitably means that its skewed towards Labour supporters.
Thanks to Eric in the comments.