BREEZING into the MTV studios on Thursday are Charles and Eddie, two singers who take their Sam and Dave routine seriously. As practitioners of the lost art of soul, they are hot on the charts with their debut album Duophonic. Charles Pettigrew and Eddie Chacon met over a copy of Marvin Gaye's Trouble Man while riding the subway in New York. They discovered they were recording in the same studio and their partnership was born. The Hongkong trip is a public relations exercise but they may be back for a concert in June or July. MTV will be airing its Charles and Eddie spot soon - watch here for details. WITH the uproar in the arts community regarding the Government's Arts Policy Review, it might be worth a trip to the Fringe Club on Thursday at 6 pm to listen to Oliver Bennett. An expert on cultural policy from the University of Warwick in England,Bennett is giving a talk entitled British Cultural Policy within a European Context. Bennett can sympathise with Hongkong's dilemma on who should call the shots and where the money goes. ''There are similarities to our situation in Britain, where we have just created the Department of National Heritage. It's like the Ministry of Culture in France which brings together arts and culture under one umbrella. And, of course, people argue about whether the government should be taking a more direct role.'' Call the British Council on 879-5138. FILM director Mark DiSalle has left Hongkong for personal reasons after some preliminary casting last week at Salon Films for the feature Bloodsport II. Filming has been postponed. Bloodsport II is to feature Jean Claude Van Damme, star of Bloodsport.