See units of production.

Administrative / biographical background
During the eighteenth century, the Sandbach family were trading out of Liverpool to British Guiana, where they acquired various sugar estates which they farmed, and employed enslaved Africans extensively. The sugar was exported to Britain and the family owned its shipping until the middle of the nineteenth century. The two firms of Sandbach, Parker & Co and Sandbach Tinne & Co merged to create The Demerara Co Ltd in the early 1900s by G.R. Sandbach (d.1907). The Demerara Co continued as sugar growers in British Guiana, also as merchants selling goods (often under the name Sandbach, Parker) in British Guiana and elsewhere in the Caribbean. They were no longer ship owners. The majority of their crop was sold as crude sugar to Tate & Lyle. The company went public in 1961, and was subject to a successful takeover bid from Jessel Securities in 1969. G.R. Sandbach's descendents (by daughters' and nieces' marriages) are named Borwick, Toller and Mackesson-Sandbach. Ian Mackesson-Sandbach (G.R. Sandbach's great nephew) worked for a firm of insurance brokers taken over by Jessel Securities, and was transferred to their subsidiary, the Demerara Co, in c.1970.