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?

Tracking poll results reflect an overall pattern of campaign events that are unfolding day by day.

CNN: About the Tracking Polls

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