Leyland set up a bank in order to finance the slave voyages of other slaver traders.
Enterprize made three enslaving voyages and then in 1787 became shipwrecked near Jamaica after it had disembarked its slaves and was returning to Liverpool.
Under Dolben's Act, Enterprize was authorized to carry 238 captives without facing penalties for overcrowding.
[3] In 1802, Leyland entered into a banking partnership with Clarke and Roscoe, a firm of Liverpool bankers.
William Roscoe, one of the partners was a leading abolitionist and this bank was dissolved within 2 months.
In 1806, Leyland set up his own bank, with his nephew and fellow slave trader Richard Bullin.
In 1807 the slave trade was made illegal in the United Kingdom and Leyland & Bullin diversified their banking operations.
[7] In April 1799, during the mayoralty of Leyland, Liverpool council submitted objections to the UK government's early anti-slavery legislation.