Conservatives just six points ahead of Labour in new YouGov and ICM polls.
New YouGov poll shows hung parliament remains likely.
Tories retain large lead over Labour but hung parliament cannot be ruled out.
Tory lead rises to ten points in new YouGov poll, large enough to give Cameron a majority.
David Cameron set to win a small majority, according to latest YouGov poll.
Tory lead cut to five points in latest YouGov poll and to seven in new Populus poll.
Conservative lead down two points in first poll since Gordon Brown called an election.
David Cameron on course to win a small majority, according to new YouGov poll.
New ICM poll suggests Labour could remain the single largest party after the election.