As a result, he was often distrusted by progressive voices because of his conservatism, and regarded with suspicion by many Tories who saw evangelicals as radicals, bent on the overthrow of church and state. In 1786, Wilberforce leased a house in Old Palace Yard, Westminster, in order to be near Parliament. He began using his parliamentary position to advocate reform by introducing a Registration Bill, proposing limited changes to parliamentary election procedures. He brought forward a bill to extend the measure permitting the dissection after execution of criminals such as rapists, arsonists and thieves. The bill also advocated the reduction of sentences for women convicted of treason, a crime that at the time included a husband's murder. The House of Commons passed both bills, but they were defeated in the House of Lords. The British initially became involved in the slave trade during the 16th century. By 1783, the triangular route that took British-made goods to Africa to buy slaves, transported the enslaved to the West Indies, and then brought slave-grown products such as sugar, tobacco, and cotton to Britain, represented about 80 percent of Great Britain's foreign income. British ships dominated the slave trade, supplying French, Spanish, Dutch, Portuguese and British colonies, and in peak years carried forty thousand enslaved men, women and children across the Atlantic in the horrific conditions of the middle passage. Of the estimated 11 million Africans transported into slavery, about 1.4 million died during the voyage. The British campaign to abolish the slave trade is generally considered to have begun in the 1780s with the establishment of the Quakers' anti-slavery committees, and their presentation to Parliament of the first slave trade petition in 1783. The same year, Wilberforce, while dining with his old Cambridge friend Gerard Edwards, met Rev. James Ramsay, a ship's surgeon who had become a clergyman on the island of St Christopher (later St Kitts) in the Leeward Islands, and a medical supervisor of the plantations there. What Ramsay had witnessed of the conditions endured by the slaves, both at sea and on the plantations, horrified him. Returning to England after fifteen years, he accepted the living of Teston, Kent in 1781, and there met Sir Charles Middleton, Lady Middleton, Thomas Clarkson, Hannah More and others, a group that later became known as the Testonites. Interested in promoting Christianity and moral improvement in Britain and overseas, they were appalled by Ramsay's reports of the depraved lifestyles of slave owners, the cruel treatment meted out to the enslaved, and the lack of Christian instruction provided to the slaves.