Don't know if this is any help Sharon
Not mentioned 1873 or before
1876-1880. Stewart&McDonald,wholesale.warehouseman.2 Eldon.chambers.Cherry St
1883, 1884 Not listed, but Eldon Chambers appear to have been demolished, and New Eldon chambers built – perhaps for much higher rent than they wanted to pay.
1888. Stewart & McDonald, warehousemen, Little Cherry street
1890. Stewart & McDonald ,warehouseman, Commercial buildings, Cannon St.
1892-1904 , Stewart & McDonald ,warehouseman, Bute warehouse, Cannon St.
1908. Stewart & McDonald, warehousemen, Fletcher's chambers, Fore street
1912. Stewart & McDonald Limited, warehousemen, 8 Great Western buildings, Livery street
1921. Stewart & McDonald Limited, warehousemen, 8 Great Western buildings, 6 Livery street
1932. Campbell, Stewart & Macdonald, warehouseman, 8 Great Western buildings, 6 Livery street
By 1940 the address had altered to 7, Great Western Buildings, though this may merely be a renumbering. Between 1944 and 1949 the firm disappeared.
Mike