British authorities Saturday held a national exercise to test preparedness for an Ebola outbreak in the country following recent enhanced screening among arrivals from countries affected by the disease.Senior ministers government departments and expert medical professionals from ambulance services hospitals and Public Health England along with the country's chief medical officer took part in the national exercise Xinhua quoted the British Department of Health as saying. To ensure the public is protected Prime Minister David Cameron has ordered the exercise as part of the Britain's ongoing contingency planning. The eight-hour exercise involved actors simulating Ebola symptoms and emergency services responding