Labour sources say they expect to take Thurrock from the Conservatives by as many as 2,000 votes. The Tories had a majority of 92 over Labour in 2010.
More top news
Speculation that the PM will be ousted from Downing Street has reached fever pitch.
Newly-released papers show a young David Cameron condemning ‘Euro red tape’ while working as a researcher for the Conservative Party in 1988
The Viking Sky sent a mayday call after losing engine power, prompting the start of an evacuation of 1,300 passengers and crew .