UPD: 

According to the official results, and after all votes were counted in all 382 polling stations, 17,410,742 Briton voted for the UK to leave the EU (51.9%), against 16,141,242 (48.1%) who voted to remain in the EU.

Britain is to leave the European Union after a nearly half a century of membership plunging the country into unchartered political and economic territory and almost certainly spelling the end of David Cameron’s political career.
At just after 4.40am in the morning the BBC declared the result for Brexit after a surge in support for leaving the EU confounded predictions and led the pound to fall to its lowest level for 31 years.
Middle England joined forces with the country’s industrial heartlands of the North-east and North-west to comprehensively reject warnings of economic Armageddon and voted to leave.
Support for remain was strongest in London and Scotland but with cities like Sheffield and Sunderland joining with Canterbury, Torbay and Peterborough in favour of Brexit momentum drifted away from remain.
The result will now trigger a process of British withdrawal from the European Union and quite possibly another referendum for an independent Scotland.
Labour said David Cameron should “seriously consider his position”. He is not expected to make a formal statement until after the official result is declared.
The Ukip leader Nigel Farage claimed victory, saying that “dawn was breaking on an independent United Kingdom”. Provocatively he said he hoped the vote would be a catalyst for the complete collapse of the European Union.
The polling expert Professor John Curtice said Labour supporters appeared to have defied pleas from their party to support Britain’s membership of the EU – tipping the scales in favour of Brexit.
With 338 out of 382 local authority areas declared, the Leave campaign had won 52 per cent of the vote compared to 48 per cent for remain.

Source: Independent