There appears a paucity of research; Historians have traditionally considered it unlikely that Guernsey merchants were ever involved in the slave trade. But see Brycchan Carey’s chapter entitled From Guinea to Guernsey, from Cornwall to the Caribbean: Recovering the History of Slavery in the Western English Channel in Donington, K et al (2016) Britain’s History and Memory of Transatlantic Slavery Liverpool University Press; Liverpool for a useful overview on what has been uncovered.
Brycchan Carey has also done a lot of research around Oluadah Equiano, a freed slave who came from Nigeria, and who wrote an autobiography about his life, and in that gives an account of being in Guernsey for a few months in 1755 as a boy who was enslaved at the time.
THE NAZI USE OF SLAVE WORKERS DURING THE OCCUPATION
There is a wealth of information available on this. More soon as we compile an authoritative list of references and sources