With some of the nation's most marginal seats found in the west London area, there is the very real prospect of a recount.
Constituencies such as Richmond Park have a slim majority, and a recount is needed when a seat is separated by a small number of votes.
By 6.30am, recounts had already been taking place for Richmond Park as it was a close call between Zac Goldsmith for the Conservatives and Sarah Olney for the Lib Dems.
Candidates can request a recount to produce a decisive – or more accurate – outcome after a day of voting and counting.
The returning officer will then decide how to proceed.
If the result is very close or will affect a candidate’s deposit (£500 which they get back if they receive 5% of the votes), the returning officer can be asked for a recount.
The officer can then perform a count in 50 ballot paper bundles to get things done quickly and in bulk.
Or for a more thorough recount – if things are very tight – the returning officer can request that every ballot paper can be counted again.
Although this may seem exhausting, there is actually no limit on how many recounts can be requested, making it a potentially long night.
The record for recounts is seven.
If things end in a complete tie lots can be drawn to decide the winner.
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