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Architects, active c.1886-1928. Tower Hamlets Idea Catalogue provides the following: 

"The brothers John {Flint Clarkson, we believe} (1838-1918) and Samuel Flint Clarkson (c 1839-1915) were born in Glasgow. The 1861 census shows them in lodgings in Islington; John described as Architect and Surveyor and Samuel Flint as architect. John, as architect, first appears in the London trade directories for 1865 at 36 Great Ormond Street; in the 1871 census both are shown as living with their mother in St Albans along with their sister Emma and brother William (c 1852-1932) (both born in Bedford). By 1873 John was in partnership with brother Samuel Flint Clarkson, still in Great Portland Street. Their connection with Poplar would seem to date from about 1879 for it is the trade directory for that year that John and Samuel Flint Clarkson first appear at High Street Poplar, and the Clarkson brothers and their children had a long association with the town. By 1905 the trade directory describes the firm as John and William Clarkson of Great Ormond Street and Poplar High Street. Messrs Clarkson were responsible for designing a number of significant buildings in the area some of which are listed below. William Clarkson was a member of the Poplar District Board of Works and Architect to the Poplar and Stepney Sick Asylum and District Surveyor for Poplar. He was also Churchwarden of All Saints, Poplar and involved in various local institutions. On his retirement the business was conducted by his son, also William (d 1935) and partners, W Till and Roland R English. By this time the business conducted was that of auctioneer, surveyor and estate agent, based in Philpot Lane, Fenchurch Street and 87 East India Dock Road, Poplar, though George Flint Clarkson, the son of Samuel Flint Clarkson continued in architectural practice at Great Ormond Street."

That catalogue entry contains a list of 17 buildings by the Clarksons, all in the Poplar, Millwall area.