Britain must start the exit process as soon as possible, said European Chiefs as the United Kingdom on Friday voted in a historic referendum to 'leave' the European Union after a partnership of 42 years. Out of 12 regions, only three, Scotland, Northern Ireland, and London voted to remain in the EU, while the others led the “Leave” vote to win by a narrow margin. The British Prime Minister David Cameron said in an address that the country will need a new Prime Minister by October as he will continue only for the next three months. The Buckingham Palace on Friday said Cameron is meeting Queen Elizabeth today in the wake of the referendum vote. #Watch via ANI FB Live: Former London Mayor & Pro #Brexit campaigner Boris Johnson speaks after UK votes to leave EU — ANI (@ANI_news) June 24, 2016 Meanwhile, speaking to reporters today, Pro-Brexit campaigner Boris Johnson praised British PM Cameron following the referendum. "I believe he is one of most extra-ordinary politicians of our age. There's no way of dealing with a decision on this scale except by putting it to people," said Johnson. "EU has become too remote, too opaque and not accountable enough to the people it is meant to serve. This doesn’t mean that UK will be in any way less united nor does it mean that it will be any less European. We cannot turn our backs on Europe, we are a part of Europe," added Johnson. Watch Video: What's making news The results from Thursday’s landmark referendum gives an outcome that sets the country on an uncertain path and deals the largest setback to European efforts to forge greater unity since World War Two. The British pound collapsed on Friday to its lowest level in more than three decades, and there was chaos also on equity and oil markets as the Brexit vote sparked a wave of panic across trading floors.