WILLIAM JAMES A wealthy Nigerian politician and his wife were convicted of trafficking a street trader from Lagos to Britain to illegally harvest his kidney for a transplant for their seriously-ill daughter. Prosecutors said Ike Ekweremadu, 60, and his wife Beatrice, 56, had brought the man to London in February last year with the offer of a few thousand dollars for his organ and the promise of work in Britain. Ekweremadu, an opposition senator in the southern Nigerian state of Enugu and also a former deputy senate president, and his wife were significant figures in Nigerian society with power, influence,…