ISLAMABAD: Former premier Nawaz Sharif has left for London to visit his ailing spouse Kulsoom Nawaz. He along with his daughter Maryam Nawaz departed Tuesday for London from Lahore airport via Doha through foreign airline QR-629 on a five days visit. Kulsoom is undergoing treatment for lymphoma at a London hospital. Accountability court had earlier accepted exemption plea of Nawaz for seven days. The court has already exempted Maryam from appearance from November 15 to December 15.