Far from considering retirement, 60 year old Bett boss Ronnie Hanna still has many plans for his firm. He tells Steve Menary where he&’s heading with Scotland&’s last quoted housebuilderRonnie Hanna is something of an endurance man and not just when he is out running on the grassy knolls of Edinburgh. As chief executive of Scottish-based housebuilder Bett, Hanna is …