Labour have held the seat of Feltham and Heston in a by-election after the death of their MP Alan Keen last month.
Labour polled 12,639 votes, and the Tories polled 6,436, meaning Labour extended its majority on the general election by nearly 2,000 votes to 6,203.
Perhaps the most interesting numbers of the night were between the Lib Dems, who polled just over 1,300 votes and UKIP, which polled just over 1,200. This is a fairly accurate translation of recent opinion polls, which have put the two parties neck-and-neck.
Labour's winning candidate and the newest MP in Parliament, Seema Malthotra, said the by-election had been: "A vote of confidence in the way Labour is changing," and "a wake-up call for David Cameron."
The Tories will probably attempt to claim that the seat was won on postal votes, many of which would have been cast before David Cameron's veto of an EU treaty a week ago. If everyone had voted this week, you can imagine them saying, the result might have been different.
Speaking to HuffPost UK before the polls closed, one Tory activist said they expected Labour to win: "I've seen a lot of UKIP posters, and I was a teller at different polling stations and no Labour person came, they think they have it firmly in the bag."
The campaign has felt fairly lacklustre for the two main parties - only the Tories or Labour can win here - with a visit to the constituency by HuffPost UK last weekend revealing a largely apathetic electorate.
The Tories have been trying to keep their spirits up during the campaign, despite polling data commissioned by Conservative peer Lord Ashcroft which suggested at one point Labour were leading by 22 points.
Ed Miliband has been campaigning in the seat in recent days, after some criticism of his apparent absence from any of the campaign literature in the first couple of weeks.
The by-election gives the The Labour leader a more cheerful end to what's been a fairly miserable week in the national media, with two opinion polls showing his party's support eroding - and another poll showing the Tories taking the lead.
It hasn't been helped by yet another uninspiring performance at PMQs on Wednesday and a general consensus that a majority of the public are backing the Tories' approach to both Europe and the economy.
CREDENTIALS: Malhotra would be the first female MP in Feltham and Heston's history. Currently the director of the Fabian Women's Network, she was also political adviser to Harriet Harman. AGE: 39 LIKELIHOOD OF WINNING: The front-runner - but does it all depend on the weather LIKEABILITY: Known in Westminster for being both engaging and likeable, Labour MPs, peers, party workers and volunteers have been happy to go down to the constituency to help out SHE SAYS: This is my hometown. My days while campaigning are about 16 hours long, out on the campaign trail for about 13 hours. It's a fantastic time, I feel really really lucky.
CREDENTIALS: Leader of the Conservative Group on Hounslow Council for the last nine years, has fought the last two general elections as the Conservative Candidate. AGE: Not disclosed LIKELIHOOD OF WINNING: Bowen is on 30% in the latest polls but is well outstripped by the Labour party LIKEABILITY: A keen football fan, he could talk about his team Swansea City down the pub
CREDENTIALS: A high street solicitor who lives in nearby Twickenham, he's taken two weeks leave to campaign. Crouch specialises in mental capability cases, and mental health causes would be a passion he'd carry over if he were elected. AGE: 35 LIKELIHOOD OF WINNING: Crouch will be fighting off UKIP to come third LIKEABILITY: Strong - Crouch is a good communicator, and funny too. Plus, he says he was not star-struck when he met Nick Clegg. HE SAYS: "People are very open-minded to what we have to say."
CREDENTIALS: Housing spokesman for UKIP and has previously stood for election (but as a Conservative candidate). AGE: 44 LIKELIHOOD OF WINNING: The question is, will he beat the Lib Dems? LIKEABILITY: The self-dubbed Dr Earth founded the world's first ecological nightclub (see him in promoter mode in the video above). He's also described himself as a "tantric master" and been called 'Dr Evil', on account of his appearance. HE SAYS: "I have stood for parliament before and I know the effort required. Previously, I stood as a Conservative, but that party has let everybody down which is why I am now standing for UKIP. The Tories are now completely detached from the British people. They failed to give us the referendum that they promised on our EU membership which is now costing us in excess of £50million everyday."
David Furness (BNP) Daniel Goldsmith (Green) Roger Cooper (English Democrat) George Hallam (People Before Profit) David Bishop (Church of the Militant Elvis)
Next to Heathrow , many workers in the West London constituency depend the airport for jobs. Alongside blue collar workers, the constituency is also home to a large Sikh community. Mark Gettleson at political pulse writes: This is just the kind of working class suburban constituency that, along with neighbouring Hayes & Harlington, flirted with Margaret Thatcher during her 1983 and 1987 landslides, before reverting back to Labour.