Historical polls
After hours of slaving in the library Mark Pack has put up a spreadsheet of all the polls he's been able to locate since 1943 - you can download it from Mark's site here. It's relatively easy to find polls back into the 1980s when MORI and ICM's predecessor Marplan were active. It becomes more difficult as you go back into the 1970s and before, when increasingly one can only find the regular Gallup polls, and polls from the election campaigns, with mid-term figures from NOP, RSL, ORC and in-house newspaper polls not easily accessible.
Guilt tripped by Mark's hard work, I've updated the historical polls listed down the right-hand sidebar of the site to go back to 1970 (pre 1992 data is mostly courtesy of Mark!). I shall try to add some nice graphs to them all... assuming I don't get sidelined and forget about them like I did last time.