This firm was acquired by the Imperial Tobacco Company in 1930, of which company Sinclair was later chairman from 1947 to 1959 and president. He was also Chairman of the Finance Corporation for Industry and of the Bristol Waterworks Company.
This company was absorbed by Imperial Tobacco in 1930, a role Sinclair later filled as chairman from 1947 to 1959 and president. He also headed the Finance Corporation for Industry and Bristol Waterworks Company.