Proportion of decided voters who will cast a ballot to reject the proposed alternative vote system increases by three points points since April.
Practically three-in-five decided voters would cast a ballot to keep the existing first past the post system.
Labour Party maintains the upper hand, as UKIP drops two points.
Decided voters are almost evenly split when assessing the new alternative vote system.
A majority of respondents are still “not too informed” or “not informed at all” about the proposed electoral system.