Persimmon has achieved “strong results” for the first six months of 2018, with its pre-tax profit rising 13% to £516.3 million against its half year in 2017. During the six months ending June 30 2018, the volume housebuilder’s housing sales volumes lifted 3.6% to 8,072 new home legal completions against H1 2017, with the average selling price increasing 1.2% to …