Ghana has been hailed as a shining example to all of Africa - a model of democracy, decent governance and responsible economic management in a continent struggling to fulfil its potential. But if Ghana looks like a success story to outsiders, how does it look to Ghanaians themselves?Nana Akufo-Addo is the leader of the main opposition party and candidate for president. Stephen Sackur asks him if Ghana can use its resource wealth and inward investment to benefit the many, not just a few.