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The seats below are the 194 most marginal in Britain, needing up to a 5% swing to change hands.

The Tories need 20 more seats, or a 2% swing, to gain power. In the seats below, the majority over them in 2010 was less than 10%.

Labour needs 68 more seats, or close to a 5% swing, to gain power. In the seats below, the majority over them in 2010 was less than 10%.

In the seats below, the majority over the Lib Dems in 2010 was less than 10%.

The 2010 election resulted in a hung Parliament and the formation of a coalition between the Conservatives and the Liberal Democrats.

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* This seat is a three-way marginal. The party has a chance of winning here from place.

Why is the swing needed here above 5%? In 2010 the party in first place had a majority over the party in third place of less than 10%. This means that a swing of 5% from first place to third place would be enough for the party in third place to overtake the party in first place. But, if the share of the vote for the party in second place remains the same, the third placed party would need the higher swing shown to beat the second placed party and so win the seat.