People of African descent were fewer in numbers in England in the days before the American Revolution and generally better treated. Most of the Black people of England at that time had been brought there as personal servant-slaves from the North American colonies or the British Caribbean possessions. A court ruled in 1772 that slavery in England was illegal and immediately there was a substantial number of free Black men in the cities of England. The story of the declaration of the illegality of slavery in Britain is an interesting one.
In England at that time there was a religious sect called the Evangelicals but popularly known as the Saints. The Evangelicals were morally strict, being against alcoholic beverages, swearing, overeating and lewdness. They required also strict adherence to the sanctity of the Sabbath. They also opposed slavery and several prominent Evangelicals devoted their lives to the abolition of slavery. One of these, William Wilberforce, was instrumental in getting England to suppress the Atlantic slave trade. Another Evangelical or Saint was Granville Sharp. Granville Sharp was a key figure in the court decision which made slavery illegal in England. He was thrust in that role by chance. Granville Sharp
One of Granville Sharp's brothers was a surgeon. One day Granville Sharp was visiting his surgeon brother and literally bumped into a slave, Jonathan Strong, who had been beaten by his owner so severely that it affected his eyesight. That owner had deemed Jonathan Strong worthless, beat him in the face and threw him into the street. Sharp and his brother put Strong into a hospital and when he recovered his health they gave him clothing and got him a job as a servant.
Two years later the legal owner of Strong, a lawyer from Barbados, saw Strong working as a servant and sought to reclaim him as his property. The owner had Strong arrested, who fearing for his life, got a message sent to Granville Sharp.