LAHORE (INP) - Punjab Chief Minister Shahbaz Sharif is leaving for London today (Sunday) where he is likely to meet MQM Chief Altaf Hussain, reported a private TV channel quoting sources. Shahbaz Sharif is traveling to London for medical checkup. On Saturday, PML-N Chief Nawaz Sharif had hinted at the formation of a grand opposition alliance. Sources added Shahbaz Sharifs meeting with Altaf Hussain would be a major step in the formation of grand opposition alliance.