that was abolished in 1807. Slavery itself wasn't abolished for another 26 years.
The slave trade was deeply embedded in the economies of England, the Americas, and much of Europe; many merchants, ship owners, bankers, and politicians feared an economic collapse if the slave trade were abolished. But others, particularly eyewitnesses of the slave trade, were so appalled that they resolved to put a stop to it. Leading this crusade was William Wilberforce (1759-1833), a Member of Parliament whose evangelical convictions made him an exemplar of humanitarianism. Wilberforce and a cadre of like-minded reformers worked tirelessly to raise public awareness of the cruelties of the trade and to pressure Parliament for reforms. After years of setbacks and defeats, the slave trade was abolished in the British Empire in 1807. It took 26 more years of agitation to abolish slavery within the British Empire. In the U.S., the movement to end slavery, abolitionism, also involved many Christian activists.
http://demo.lutherproductions.com/historytutor/basic/modern/genknow/end-slavery.htmAfter the passing of Abolition of the Slave Trade Act in 1807, British captains who were caught continuing the trade were fined £100 for every slave found on board. However, this law did not stop the British slave trade. If slave-ships were in danger of being captured by the British navy, captains often reduced the fines they had to pay by ordering the slaves to be thrown into the sea.
Some people involved in the anti-slave trade campaign argued that the only way to end the suffering of the slaves was to make slavery illegal. A new Anti-Slavery Society was formed in 1823. Members included Thomas Clarkson, Henry Brougham, William Wilberforce, Thomas Fowell Buxton, Elizabeth Heyrick, Mary Lloyd, Jane Smeal, Elizabeth Pease and Anne Knight).
Parliament passed the Slavery Abolition Act in 1833. This act gave all slaves in the British Empire their freedom. The British government paid compensation to the slave owners. The amount that the plantation owners received depended on the number of slaves that they had. For example, the Bishop of Exeter's 665 slaves resulted in him receiving £12,700.
http://www.spartacus.schoolnet.co.uk/Lslavery33.htm