One source said the management, led by chief executive David Calverley, was still considering the future of the two offices.
The source said: "The jury is still out as to whether they will be closed. People are already leaving the two offices."
One analyst said the decision was strategic. He said: "The company is looking at pulling out of the less good bits. It is reorientating into partnering and support services, and moving away from competitive tendering."