Nigeria has been drifting. In the two years since president Umaru Yar’Adua took office, much has been promised in the way of reform. Little has been delivered. Progress in tackling corruption has reversed. Measures needed to address flaws in the electoral system are blocked. And new legislation aimed at re-energising the oil industry has languished in parliament. Excitement in investor circles about the country from which one in five black Africans hails has given way to unease.