England, like many of the European powers, vastly benefited from the slavery in the Americas through trade. Former English territories such as South Carolina (it was theirs for a century leading up to the Revolutionary War) or Georgia, were aggressive slave states and England was heavily responsible for that condition. England was the largest slave trader in the 18th century, as such the foundations of slavery particularly in the colonies were overwhelmingly their responsibility. England's wealthy slave owners were still very active in the slave trade well into the 19th century (into the 1830s). Their direct role in the slave trade, as such, didn't cease until about 50-60 years prior to the industrial revolution (their indirect role, responsibility and benefit extends far longer than that).
European powers outsourced their slavery to the Americas, directly funding, operating and protecting it, while feigning morality about it at home.