Sadiq Khan has announced plans to become the first mayor of London to lead a trade delegation to Africa.Precise details have yet to be confirmed but an announcement of the countries Mr Khan plans to visit is expected next year.He made the commitment during a speech to the 15th anniversary awards of the Guba (Grow, Unite, Build Africa) organisation at Marlborough House, the Commonwealth Secretariat’s central London headquarters, last Friday night.Guba’s founder and president Lady Dentaa Amoateng is a British Ghanaian entrepreneur and actor – which could suggest Mr Khan may visit the west African nation.