Miller Homes has updated its targets following a strong performance in 2016, with the housebuilder now aiming to reach 4,000 completions a year by 2020 with an operating margin of above 20%.The targets require an ambitious 68% growth in completions in the next four years, with the firm completing 2,380 homes in 2016 (2015: 2,153). Of these, 2,032 were private …