BBC News Review: UK to begin the process Brexit
Brexit Five challenges for the UK when leaving the EU.
Image copyright Getty Images Image Caption Is this the City of London remains leading financial center of Europe.
The campaign to leave the European Union won the referendum That means that the UK is now engaged to withdraw from the group of 28 countries, a process that came to be known as Brexit What this mean for the UK and EU.
Image copyright AFP M. Cameron Legend of the left image EU concessions won - but not enough to satisfy voters UK.
The agreement that Prime Minister David Cameron has negotiated with the EU in February, giving the UK a special status as an EU member, will now be scrapped.
The UK has won a guarantee that he would not suffer discrimination by being outside the euro area that would protect the city of London Authority, as the largest financial center back in Europe, the United -um promised not to block further integration of the euro area.
If the UK is able to negotiate continued access to the EU single market on preferential terms the agreement should not include guarantees of non-discrimination.
Image copyright AFP Image Caption The Lisbon Treaty of 2007 for the first time explained how a Member State could leave the EU.
M. Cameron said he will step down in October and transferring continuing role to invoke the EU Article 50 procedure to negotiate the withdrawal of the United Kingdom.
Article 50 of the Lisbon Treaty, which has never been used before, a fixed period of two years to reach a general agreement considered a tight deadline, it may be extended if the 28 member states agree .
Once the UK tells EU it derives from Article 50 will not participate in the discussions of the European Council or Council or in decisions concerning the rule says so on some issues in the UK will cut EU decision making at the highest level before it actually leaves.
The process requires the UK to unpick some 80,000 pages of restrictive laws in the UK to the EU Some will be kept, because some areas of EU policy are shared with third countries in the EU, such as Norway and Switzerland.
Under the divorce settlement, as some have called it, the UK and the EU must agree how to allocate assets, solve the fiscal problems of the EU and define the future rights of EU nationals UK and vice versa.
The settlement must be approved by the majority of EU members and the European Parliament and the Parliament of the United Kingdom.
Image copyright Reuters Image Caption The UK has a huge volume of trade through the Dutch port of Rotterdam.
Discussions to determine the new trade agreements at EU UK could begin during the two-year negotiation period for withdrawal, but not necessarily.
If the EU is waiting for the official withdrawal of the UK, the negotiations could drag on for five or more years pending agreement, the UK trade with the EU under the WTO World Trade Organization trade.
This would mean British exporters pay new duties on imports from the EU and deal with non-tariff barriers, in the same way that China and the United States trade with the EU services in the UK - representing 80 of the British economy - would lose their preferential access to the EU single market.
Free trade deals that the EU has negotiated with 53 countries, including Canada, Singapore and South Korea, will no longer apply in the UK If the UK wants the benefits of their it will have to renegotiate with these country.
Staying the camp has full access to the EU single market - the largest free trade area in the world with 500 million consumers - is crucial to the movement in the UK but the workers, payments in Budget EU and acceptance of EU rulebook are conditions for that access.
The EU is unlikely to address these conditions because it does not want more members to leave the club The UK could sign up for these conditions, but it would not be able to influence the rules EU because it lacks a vote Many camp Brexit see this position - illustrated by Norway - unacceptable.
The main selling point of the UK is that it is a large market for EU exports, as the French food and German cars.
Image copyright Getty Images Image Caption Wales was a major beneficiary of EU funding for poorer regions.
The UK will stop paying into the EU budget once he officially leaves the block.
Thus, the current net contribution of the United Kingdom about 8 5 billion 11 billion; May 12 billions each year will remain at home it could be spent in part on the National Health Service, as some in the camp Brexit suggested or used to scrap VAT on fuel.
But British farmers will no longer get direct payments from the EU, which have a value of about 2 4 billion in 2015. It is not known how much of this, if any, the British government will continue to pay.
It is not clear how much the poorest regions of the UK will be in the future, now that they are no longer eligible for EU regional funding.
Image copyright Getty Images Image Caption Many Polish migrants arrived in London in the bus when the UK opened its doors in 2004.
The UK will try to reduce immigration to the EU, probably with a system based on points such as Australia s This means giving priority to highly skilled workers and blocking the entrance to those unskilled Many applicants EU employment can be told to leave.
But first UK will clarify the status of nearly 2 2 million EU workers living in the UK The rules for family gatherings can get tougher, but a block on the freedom of movement is not likely for at least two years, while the UK is negotiating Brexit.
Almost two million British citizens living abroad as in the EU countries - so the British measures for EU workers could trigger reprisals against British nationals abroad.
What the UK can start doing immediately, however, is to tighten the rules for migrant benefits.
Brexit will undoubtedly improve the lot of anti-EU, anti-immigration parties in some other EU countries it can also inspire eurosceptics in other countries to hold their own referendums on EU membership Brussels would see that as a domino effect - a nightmare scenario for the European project.
Brexit Five challenges for the UK when leaving the BBC News EU, brexit, challenges, leaving access to the single market.