The decision delivers a body blow to the financial services sector and will hurt UK exports.
David Cameron's trip comes amid deep political uncertainty in Britain after he failed to convince Britons to vote to remain in the EU.
First Minister Nicola Sturgeon says country may hold another secession referendum following Britain's vote to leave the intergovernmental bloc.
The impact on UK-listed stocks has been relatively muted. So what happens when the votes are counted on the 24th?
Voting begins today, after months of continuous campaigning from the 'Remain' and the 'Leave' sides, and the results should be in on Friday morning.
If the pound takes a major tumble, British banks could call in debts and cause the rand to weaken.
A second referendum may have to be held if the ‘leave’ camp manages to win with a small margin.
Belgium's neighbours have rallied in support after this week's 'acts of war' that shook Brussels.
Delegates will discuss a controversial plan for a new European Union force that could shore up borders without the host country's consent.
Wealthy or not, exit backers are swimming against a tide of business leaders urging the country to stay in, including top executives.
While European countries continue to weigh up their migrant policy, hundreds of thousands of refugees continue to flee war and poverty.
European countries are turning on one another as growing border chaos tests the limits of diplomacy.
The current confrontation will shape resistance to austerity - and the future of the whole of Europe.
European leaders wait for signs that Prime Minister Alexis Tsipras is ready to compromise as Greece fails to make its IMF payment.
Six large energy companies have asked the United Nations for help in setting up a carbon pricing scheme that would include their operations.
The euro leapt, Greek bond yields fell, but nothing actually changed in another day of talks with international creditors.
The EU is considering fielding a naval force to deal with increasingly deadly Mediterranean crossings, but the plan would have to favour with the UN.
A proposal to divide up numbers between EU states in the wake of the Mediterranean crisis could pit Germany, which backs the scheme, against the UK.
EU paymaster Germany criticised the Greek proposal as "not a substantial solution" as it failed to fulfil bailout conditions.