Kolkata: The split between Trinamool Congress chief Mamata Banerjee and her former right hand man Mukul Roy is almost certain. The party's disciplinary committee today met in Kolkata to discuss 'prima facie' anti-party statements by Mr Roy's son, Subhrangshu, who is the Trinamool MLA from Bijpur in North 24 Parganas, a seat he won in