UK risks losing last AAA rating as S&P eyes EU exit vote

By David Milliken LONDON (Reuters) - The only major ratings agency to still give Britain a top-notch credit rating said the country risked a downgrade due to Prime Minister David Cameron's decision to hold a referendum on leaving the European Union. Standard & Poor's lowered the outlook for Britain's triple-A rating to negative from stable on Friday, saying the EU vote "represents a risk to growth prospects for the UK's financial services and export sectors, as well