Both founding partners died in 1938, at which time most of the construction projects stopped. During the 1940s after World War II, it began expanding and working on additional projects, some of which including repairing of roads and bridges damaged or destroyed during the war, and, later, included the Victoria Line of the London Underground and Australia's Melbourne Underground Rail Loop. The firm continued in these fields until the merger with Sir M MacDonald & Partners in 1989, at which time it was also working on the Channel Tunnel between the United Kingdom and France beneath the English Channel.