The Ugandan journalist and broadcaster Andrew Mwenda is in London telling anyone who is prepared to listen that aid has been a disaster for Africa, fuelling corruption and hindering development. For Tony Blair and the G8 leaders who meet next week in St Petersburg, for Bono, Bob Geldof and all the other celebrity campaigners for generosity towards Africa, Mr Mwenda has a curt message: stop the aid and stop the debt relief.