As the polls close in the UK's historic EU referendum, early indications are that the campaign to remain in the EU has a narrow lead.
A YouGov projection based on a survey of almost 5,000 people on polling day suggests Remain ahead, with 52% to Leave's 48% - whilebookies and financial markets appeared to be banking on the UK staying in the EU.
YouGov's Joe Twyman said: "The results are close and it's too early to call it definitively. But these results, along with the recent trends and historical precedent, suggest a Remain victory is the more likely outcome."
As voting stations closed their doors at 10pm, there was a spike in the value of sterling and leading Leave campaigner Nigel Farage told Sky News: "It looks like Remain will edge it."
As expected Gibraltar, the first area to declare a result, voted resoundingly in favour on staying in the EU, while Remain also won Newcastle-upon-Tyne - but the narrow margin of victory caused sterling to fall back.
Leave's win in Sunderland, with 61% of the vote, was a wider margin of victory than expected. Arriving at a Leave campaign party, Mr Farage said he was not conceding and blamed any possible defeat on the Government's registration scheme.
He added: "The Eurosceptic genie is out of the bottle - it will not be put back in...win or lose this battle tonight, we will win this war."
Theresa Villiers from the official Leave campaign told Sky: "My instinct is that Remain have won."
Boris Johnson tweeted: "The polls have now closed, democracy has been served + we await the verdict of the people. Thanks to everyone involved + everyone who voted."