The surprise surge ahead by the Conservatives led by 48-year-old charismatic Cameron saw the party come back to power with 331 seats, just crossing the half way mark in the 650-member parliament and is tipped to get four more.

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"This is the sweetest victory of all," Cameron told jubilant supporters at the party headquarters after the victory following which he does not need his ally Liberal Democrats with whom he had run the government since 2010.

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Later in the afternoon, he met Queen Elizabeth II to seek her customary approval to form a new government.

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Speaking in front of 10, Downing Street alongside his wife Samantha, Cameron cited that "we are on the brink of something special in our country. As a majority government we will be able to deliver all our manifesto."

"We will govern as a party of one nation, one United Kingdom. That means ensuring this recovery reaches all parts of our  country, from north to south, to east to west," he added.

Prime Minister Narendra Modi was among the first international leaders to congratulate him on Facebook with a reference to his campaign slogan: "As you rightly pointed out – it's 'Phir Ek Baar, Cameron Sarkar!' My best wishes."

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