My friend Robert Benewick, who has died aged 90, was a political scientist who made major contributions to our knowledge of British and Chinese politics. He was also a soft-spoken fighter for social justice and international understanding. He first visited China in 1975 and over the next 40 years held four visiting professorships at Remnin University of China. In collaboration with British, American and Chinese colleagues he produced seven books and scores of articles on China. As a critical friend of the country he had a leading role in the…