As to slavery “no legislation was ever passed in England that legalised slavery. In the Somerset case of 1772, Lord Mansfield ruled that, as slavery was not recognised by English law, James Somerset, a slave who had been brought to England and then escaped, could not be forcibly sent to Jamaica for sale, and he was set free. In Scotland colliery slaves were still in use until 1799 where an act was passed which established their freedom and made this slavery and bondage illegal.” English merchants where happy to participate in the American slave trade. https://en.wikipedia.org/wiki/Slavery_in_Britain