Dec. 16 (Bloomberg) -- The U.K.’s main opposition Labour Party won a special election in west London for a vacant House of Commons seat, with an increased majority over Prime Minister David Cameron’s Conservative Party.

Labour candidate Seema Malhotra received 12,639 votes, a majority of 6,203 over Conservative candidate Mark Bowen, who gained 6,436 votes in yesterday’s election in the Feltham and Heston constituency, close to Heathrow Airport, according to results early this morning. Malhotra gained 54 percent of the vote, the BBC reported.

Labour’s Alan Keen, whose death last month led to the ballot, received 43.6 percent of the vote in the May 2010 general election, giving him a majority of 4,658. The Tories have moved ahead of Labour in some national polls this week after Cameron refused to back a European Union-wide treaty to rescue the euro on Dec. 9.

--Editors: Eddie Buckle, Ben Livesey

To contact the reporter on this story: Thomas Penny in London at tpenny@bloomberg.net

To contact the editor responsible for this story: James Hertling at jhertling@bloomberg.net