Fitch Ratings has affirmed UK's sovereign debt rating at 'AA+' on Friday. The outlook is stable.

"The UK's ratings benefit from a high-income, diversified and flexible economy. The credible macroeconomic policy framework and sterling's international reserve currency status further support the ratings," Fitch said in its statement.

The agency noted that it believed Britain's exit from the European Union (EU) would have only a moderate negative on the UK's outlook.

The agency expects the French economy to expand 1.9% in 2016 and 2.0% in 2017.