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Builders, of Moorgate Street and workshops in Camberwell and Dorking
1840 Benjamin Colls (1813/5-1878) formed Colls and Sons.
1867 Colls was elected a Common Councilman, Ward of Coleman Street, and also became Chairman of the City Lands Committee (Chief Commoner of the City).
1867 His son John Howard married Annie M. McMillan, daughter of shipbuilder Archibald McMillan
1878 On the death of Benjamin, the still small business passed to his sons (John) Howard (1846-1910) and William (1842-1893).
1880s Much of the company's building work was in the City of London, including that for the Institute of Chartered Accountants, constructed in 1889–92.