LONDON In a week when British Premier David Cameron has singled out the National Union of Students for some of its policies failing to contribute to tackling extremism, further evidence of the union's leftward drift emerged when its national executive committee censured its president for accepting a sponsorship deal with Coca-Cola when the NUS policy is to boycott the company's products. Megan Dunn who was elected NUS president in April, and her vice president, Richard Brooks, decided to ignore the NUS boycott of Coca-Cola by accepting its financial backing for an NUS awards ceremony.