At the conference in May 1830, the Society for the Mitigation and Gradual Abolition of Slavery agreed to drop the words "gradual abolition" from its title. It also agreed to support Sarah Wedgwood's plan for a new campaign to bring about immediate abolition. The following year the Anti-Slavery Society presented a petition to the House of Commons calling for the "immediate freeing of newborn children of slaves".

In 1831 Cropper and his son-in-law, Joseph Sturge, formed the Young England Abolitionists, a pressure group within the Society for the Abolition of Slavery, that campaigned for a new act of Parliament. It was distinguished from other anti-slavery groups by its unconditional arguments and vigorous campaigning tactics. Peter Archer has argued that they directed "their activities much more in the direction of forming mass opinion."