Perhaps the best known committee member of the new non-denominational abolition society, founded in 1787, was William Wilberforce, who, unlike its Quaker members, was eligible as an Anglican to be elected to, and sit in, the House of Commons. Wilberforce visited William Allen at his experimental gardens on several occasions in his role as the Society's parliamentary representative. He had long been familiar with the village, owing to family connections. His sister Sarah had married the lawyer James Stephens, whose family home was the Summerhouse, a large house adjoining Abney Park in the very grounds of the mansion that later, in the 1820s, was to become Allen's novel girls' school.