Barratt chief executive Mark Clare has reported the firm's interim results for the second half of 2007 as "satisfactory," against the backdrop of a challenging market. Following the acquisition of Wilson Bowden, Barratt increased completions by 25.7% to 9,056, but on a like-for-like basis, completions were actually down by 14.8%. It also increased operating margins to 16.8% and increased pre-tax …