The changes this latest poll registers repeat the pattern of earlier surveys this month: a substantial fall in support for Labour with both the Conservatives and Lib Dems benefiting evenly from the fall-out.
BBC: Has Labour's poll slide halted?
2.
Tracking poll results reflect an overall pattern of campaign events that are unfolding day by day.
CNN: About the Tracking Polls
3.
It was a pattern which Sheridan would repeat many times - serving jail terms for refusing to pay the poll tax and a fine after taking part in blockades at Faslane nuclear submarine base.
BBC: The rise and fall of Tommy Sheridan and the left