Agence France-Presse: Prime Minister David Cameron called Thursday for “sensible dialogue” on the BP oil spill as the energy giant’s boss faced a grilling in the US Congress over the environmental disaster. “It’s up to congressmen to make their own views heard,” Cameron told reporters in Brussels when asked about the tough comments directed at BP chief executive Tony Hayward in Washington over Gulf of Mexico spill. “Our view is that what happened is clearly an environmental catastrophe and we need …