Union minister Ram Vilas Paswan today underwent a heart surgery at London's Royal Brompton Hospital with his family saying it was successful and he was recovering.<br/><br/>A family member of the 70-year-old LJP chief told PTI that the operation was successful. The minister has been operated upon to fix a leaky heart valve by fitting a device. Mr Paswan had undergone a heart surgery earlier too.<br/><br/>He is on leave till June 14. In his absence, the additional charge of his ministry has been given to Agriculture Minister Radha Mohan Singh.