The financier Dermot Desmond is in talks to buy back betting exchange Betdaq eight years after he sold it to Ladbrokes for €30 million. Betdaq is a profitable business, but it is considered non-core to Ladbrokes which is part of London listed gambling group Entain. The price being paid for the business by Desmond is unknown, but it is thought to be less than he sold it for in 2013. Despite being part of Ladbrokes, Betdaq has remained housed in 1 Custom House Quay in Dublin’s IFSC, the same location as several Desmond controlled businesses including his investment company IIU.…