Much of this success was down to a significant increase in operating margins, up to 16.5% for the first half from 11.4% a year ago and the benefit of a first-time full contribution from John Laing, bought for £297m last November. In addition the average selling price of a new Wimpey home rose 16% to £163,000. Group profits were also boosted by a 64% jump in operating profits at Wimpey's US business, Morrison Homes, to $45m (£28m).