ISLAMABAD, April 12: Prime Minister Nawaz Sharif is expected to leave for London on Wednesday for a medical treatment he says he was putting off due to official responsibilities. A spokesperson for the PM house said that this was a long due medical treatment. Sources said that the PM cancelled a scheduled trip from Lahore to Islamabad on Monday. Punjab Chief Minister Shahbaz Sharif left for Islamabad on an emergency basis. He met Interior Minister Chaudhry Nisar Ali Khan at the PM House. Meanwhile, sources said that the PM’s son Hussain Nawaz has left for Saudi Arabia. He will spend a week there and then leave for London where he is expected to stay for two months. Hussain Nawaz has been named in the Panama Leaks for owning offshore companies.-Agencies