Dr Hull’s doctoral research focused on Anglo-Cuban relations (1898–1964), and he continues to be interested in diplomatic (or international) history, especially Anglo-American interactions concerning Latin America. A current research project is the 8-month long kidnapping of the British Ambassador to Uruguay Geoffrey Jackson by left-wing Tupamaros urban guerrillas in 1971.
A recent project was British writer Graham Greene, particularly his visits to Cuba before and following the 1959 Cuban Revolution, his spy-fiction satire Our Man in Havana (published just 12 weeks before Fidel Castro's triumph), and the film version of this novel, partly filmed on location in Havana in the first months of 1959.
Another ongoing interest is football. He recently published a non-fiction book about Brian Clough & Peter Taylor's first joint-management experience at lower-league Hartlepools United (1965-67). He is currently undertaking research on the first English footballer to play for Real Madrid (1979-82).