More than 200 applicants fear they will lose places after home secretary suspends study visas from four countriesSudanese scientists who have been promised research posts at leading UK universities have spoken of their “shock” and “sadness” that their hopes have been dashed after Shabana Mahmood’s decision to end study visas for people from their country.More than 200 Sudanese postgraduates and undergraduates fear they will no longer be permitted to take up places at 46 universities, including O...