Voters go to the polls in less than two hours to decide who will be the next MP for Croydon North.
There are 12 candidates. Labour had a comfortable majority in this seat at the 2010 general election.
The by-election comes after the death of MP Malcolm Wicks, who lost his battle with cancer in September, aged 65.
He had been an MP for Croydon North for two decades and held the seat with a 16,483 majority.
More top news
Puppies and dogs have been rescued from an address in Dagenham, after being found in appalling conditions.
Dramatic CCTV footage has captured the moment a bus driver tackled a passenger to the ground in a street fight 'over the bus fare'.
Police are trying to track down a man who sexually assaulted a schoolgirl in Bethnal Green, after posing as a plumber to get into her flat