Marginal battlegrounds in UK elections

Theresa May’s snap general election will be decided in so-called marginal constituencies – seats with majorities of 10% or less that require a swing of 5% for the incumbent party to lose

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Election 	Seats that changed hands Prime Minister 	Total seats

1979		74			Margaret Thatcher	635

1983		10			Margaret Thatcher	650

1987		47			Margaret Thatcher	650

1992		51			John Major		651

1997		184			Tony Blair		659

2001		30			Tony Blair		659

2005		62			Tony Blair / Gordon Brown	646

2010		115			David Cameron		650

2015		115			David Cameron		650


Seats with majorities of 10% or less: 112 

Conservative 54 Labour 46 Lib Dem: 5	SNP: 6	UKIP: 1

Theresa May (from 2016)  
 
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Sources: UK Polling Report, Rallings and Thrasher 

Pictures: Associated Press 

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