Construction firm boosted by £154m deal to convert arena into football club’s new home and multi-purpose venue by 2016 Balfour Beatty has won the £154m contract to convert London’s Olympic stadium into the new home of West Ham United, in a fillip for the construction firm’s struggling UK business. The project will employ up to 400 people at its busiest, as Balfour Beatty turns the 80,000-seat Queen Elizabeth Olympic Park into a multi-purpose venue taking …