THE candidates forecast to win in Herefordshire's constituencies have been revealed by an exit poll.

The Conservatives are forecast to hold north Herefordshire, while Hereford and south Herefordshire is "too close to call".

The exit poll carried out today by Ipsos UK predicts a possible Conservative hold, with 61 per cent likelihood, in south Herefordshire and a possible Labour gain, with 31 per cent likelihood. This means it could go either way between Jesse Norman and Joe Emmett, with a slight leaning towards the Conservative incumbent.

For north Herefordshire, it predicts a likely Conservative hold with a likelihood of over 99 per cent. This means Sir Bill Wiggin is forecast to hold the seat.

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What is an exit poll and how does it work?

It's different from an opinion survey. People are selected at random as they leave polling stations having just voted, and asked to complete a ballot identical to the official one.

So it asks them what they have just done, rather than what they will do in the future which normal opinion polls do.

It is intended to measure changes in vote shares from the previous election in specially chosen constituencies. This year's exit poll included 133 polling stations, so only a small fraction of the 632 constituencies in Great Britain (Northern Ireland is not included in the exit poll).

The majority of constituencies are selected because they reflect the battle between the two main parties - Labour and the Conservatives. A smaller number represent battlegrounds between the Liberal Democrats and each of the two main parties.