Laing O'Rourke, the contactor building Terminal Five at Heathrow Airport, has launched a private sector housing arm. The firm, called explo're living, will be run by former Barratt Eastern Counties md Karl Pickering under the chairmanship of ex Laing Homes boss Paul Healey. Healey was brought in to Laing O'Rourke last autumn to devise the firm's housing strategy. Laing O'Rourke …