Robinson and McKewan at number 45 Frederick Street. There was also 45A Frederick Street which was attached to the front of this building, demolished some years ago. From Wikimedia ....
"It forms a grade II listed complex with 46 Frederick St and dates to the early 19th century, when it was built as a large detached house.The earlier house on the site had extensive grounds which were sub-divided into building plots in the late 1870s. 1860 trade directory evidence suggests the house was still in private ownership; by 1875 it is listed as the address of Nathan Henry, wholesale jewellers. Large detached houses, converted to manufacturing use and now much altered and concealed are a significant feature in the Quarter's development. The house itself was remodelled in 1882 by Ewan Harper for Robinson and McKewan, manufacturing jewellers. It has since been converted into offices".