English parliment voted to abolish the slave trade february 23rd 1807.
Here are a few reliment websites.
England Should Lead the Cause of Emancipations
by Frederick Douglass December 23 1846.
http://www.yale.edu/glc/archive/1084.htm
William Wilberforce
http://www.yale.edu/glc/archive/1084.htm
British Abolitionists