There are 650 constituencies up for election in the UK

But a small number of them are likely to help decide the result of the 2019 general election

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https://bbc.in/2pgD06F 

Almost a quarter of seats currently have small majorities

That’s where the current MP won with a majority of less than 10%

In the 2017 election there were 51 of “ultra-marginal” seats, where the majority is less than 2% - about 1,000 votes

In eight seats there was a majority of less than 50

Scotland is almost entirely marginal

Of the 59 seats available, 46 were won with a majority of less than 10% in 2017

Strong Leave and Remain seats are also likely to be crucial

Seats like West Bromwich West, Bolsover and Hartlepool are all Leave targets

While constituencies like St Albans, Winchester and Cambridge are Remain areas

The Remain pact made by the Lib Dems, Plaid Cymru and the Green Party to stand aside for one another in 60 seats across England and Wales is an unusual feature of this election

But, it's impossible to know whether this will affect who wins