By Jess Jones Ladbrokes owner Entain has announced the appointment of Gavin Isaacs as its new chief executive, starting 2 September. The Australian gambling industry veteran replaces interim chief Stella David, who will succeed Barry Gibson as chair of theFTSE 100 firm following his retirement in September. Barry Gibson, chair of Entain, said: “On behalf of the Board, I am delighted to welcome Gavin to Entain. We are confident that his proven leadership and operational experience mean that Gavin is the right person to take Entain into its next chapter.” Former boss Jette Nygaard-Andersen left …