<p>Taylor Wimpey says it is on course to deliver double digit operating margin as it continues its drive to improve this area of the business ahead of volume growth.</p> <p>In its half year results posted today, the firm says margin is up to 9.3% and operating profit £67.2 million against £51.1 million in the first half of last year.</p> <p>Chief executive Pete Redfern described the period as a "transformational six months" with the sale of the North American business, the drive for increased margins and the focus on the UK. "We have a strengthened balance sheet, an increased financial capacity to invest in the UK and we are well positioned to deliver further improvement in margin and returns going forward."</p> <p>Redfern acknowledged ongoing uncertainty in the wider economic environment but said that the UK market remains stable. "We expect stability to continue for the remainder of 2011," he said.</p> <p>TW completed 4,707 homes in the period against 4,804 in the first six months of last year of which 3,675 were private (3,925). However TW has increased its outlets to 311 from 301, buying 5,289 plots on 55 outlets in the period.</p> <p>The sale of the North American business has seen …