The Case and Southworth records (380 MD 33-36) cover the years from 1754 to 1769. They are the surviving commercial manuscripts of a Liverpool merchant firm with a branch house in Kingston, Jamaica. Thomas Case was listed in the Liverpool trade directory for 1766 as a merchant in Water Street. He owned a number of ships, became a member of the African Company of Liverpool, and held shares in eighteen slaving vessels. Two of these ships, the Fortune and the Bee, were vessels where he was the sole owner; the others were co-owned with his brother Clayton and other Liverpool merchants such as William Boats and William Davenport. Thomas Case entered into an insurance brokerage business with William Gregson in 1774. This was dissolved in 1778, however, when bankruptcy proceedings were issued against Case after he fell into financial difficulties. Nicholas Southworth, who managed the Kingston end of the Case & Southworth partnership, had captained three slaving vessels from Liverpool to Africa and the Caribbean in 1746, 1748 and 1752. Southworth was the part owner of several slave vessels in the 1750s and 1760s but he never co-owned vessels with Case. The partnership of Case & Southworth appears to have flourished until the records end in 1767.The records of Case & Southworth are bound volumes with detailed information on the import of hardware, textiles and provisions from British and Irish merchants via Liverpool to Kingston; the sale of lots of slaves in Kingston; and imports of sugar, rum, pimento and wood at Liverpool. Both ends of the business, at Liverpool and Kingston, acted on commission, but sales were much more valuable at the Jamaican end (largely owing to the slave sales) than on Merseyside. The Liverpool house under Case sold on behalf of far fewer people than the Kingston branch under Southworth. This resulted from the much larger population of the Lancashire port and its hinterland compared with the much smaller white population in Jamaica. The Account Book (380 MD 33) and the Journal (380 MD 34) include a mass of daily transactions. At first sight these list a bewildering array of sales but they can be collated and analysed to indicate some interesting patterns in consumer behaviour. Some of the detailed accounts of slave sales, giving the purchasers, date of purchase, size of lot sold and prices gained, are duplicated in the two Sales account books (380 MD 35-36) but some are not. The Case and Southworth account books are some of the most detailed sales’ records of Africans in the British slave trade available in any British archive.