An anonymous reader writes: The UK has voted by 52% to 48% to leave the European Union after 43 years in a historic referendum, a BBC forecast suggests. London and Scotland voted strongly to stay in the EU but the remain vote has been undermined by poor results in the north of England. Voters in Wales and the English shires have backed Brexit in large numbers. The referendum turnout was 71.8% — with more than 30 million people voting — the highest turnout since 1992. London has voted to stay in the EU by around 60% to 40%. However, no other region of England has voted in favor of remaining. Britain would be the first country to leave the EU since its formation — but a leave vote will not immediately mean Britain ceases to be a member of the 28-nation bloc. That process could take a minimum of two years, with Leave campaigners suggesting during the referendum campaign that it should not be completed until 2020 — the date of the next scheduled general election. The prime minister will have to decide when to trigger Article 50 of the Lisbon Treaty, which would give the UK two years to negotiate its withdrawal. Once Article 50 has been triggered a country can not rejoin without the consent of all member states.