Outside politics he was a director of Vosper from 1973 to 1988, chairman of Europ Assistance Ltd (1972–88), chairman of the Anglo-Eastern Bank, director of the Northern Star Insurance Co, chairman of the Royal Automobile Club, the British Motor Sports Council (1975–82), vice-chairman of the British Roads Federation (1975–82), vice-president (d'honneur) of the Fédération Internationale de l'Automobile, president of IFPA (1969–81), and Master of the Worshipful Company of Grocers (1979–80). Bossom was also active in international relations. He was president of the Anglo-Netherlands Society (1978–89), Anglo-Belgian Society (1983–85) and the Iran Society. He received several awards from these countries.
