Johor–Singapore Causeway
After a brief return to Singapore to work on the Johor–Singapore Causeway (c.1919), he returned to rejoin Charles Meik and work on the design of the Lochaber hydroelectric scheme. When Meik died in 1923, the delivery of this ambitious project (which involved boring a main tunnel 5m in diameter and 24 km long under the northern edge of the Ben Nevis massif, and creating a series of dams and reservoirs) was left in Halcrow's hands; that same year, the firm was renamed CS Meik and Halcrow.