The British Museum has announced plans to help "investigate the history of the Kingdom of Benin", with a grand archaeology mission and new museum.The organisation will work with Nigerian teams on the creation of a new Edo Museum of West African Art (EMOWAA) and accompanying archaeology project.The plan represents one of largest physical projects the British Museum has ever undertaken outside the UK.It comes after calls for it to return stolen artefacts to the ancient city.Historians say Benin Ci