There have been several changes at the top of the housebuilding industry during the past 12 months. New faces now head up the three leading companies – Mark Clare at Barratt, Mike Farley at Persimmon and Pete Redfern at Wimpey. Meanwhile, Westbury has been swallowed up by Persimmon and Bovis has joined the top table. Chris Windle profiles the men in charge of building more than a third of the UK’s homes each year