Persimmon has posted record results for 2006 with a 17.5% leap in pre-tax profits. Chief executive Mike Farley said the successful integration of Westbury and synergy savings of £32 million in 2006 had ensured the housebuilder’s margins, 20.8%, remained at the top end of industry levels. Profits hit more than £582 million on revenue of £3.14 billion and the outlook, …