At the close of the eighteenth century the slave trade was a thriving and very big business. Prominent families held slaves and interests in the slave business, a vast swathe of people depended on slavery for their livelihoods, and public opinion was undisturbed by it. When Clarkson threw in his lot with a small group of Quakers in opposition to the trade the odds of success were seemingly impossible.

On May 22, 1787 Clarkson and about a dozen others met in the James Phillip Bookstore for the first official meeting of the Committee of the Slave Trade. They devised a strategy to gather intelligence on the trade, expose it’s inhumanity via pamphlets, posters and public lectures, and build momentum for a banning of the British slave trade. Clarkson became their only full time anti slavery campaigner. He travelled tirelessly throughout England seeking to gather intelligence on the slave trade and to draw people’s attention to its cruelty and inhumanity.

The task was incredibly difficult. Few of those involved in the slavery business would talk to him; he received death threats, and at least one attempt on his life; many mocked him. In that first year he noted

I began now to tremble, for the first time, at the arduous task I had undertaken, of attempting to subvert one of the branches of the commerce of the great place which was then before me…. I questioned whether I should even get out of it alive.

Yet the tide of opinion began to turn. Petitions containing thousands of names started to find their way to Parliament. More people joined themselves to the cause, including the potter Josiah Wedgewood, who crafted a relief of a kneeling slave with the words “Am I not a man and a brother?” that became a popular and influential adornment, and parliamentarian William Wilberforce, who championed the cause in Parliament. Hundreds of thousands stopped using sugar, the major slave produced good in England, and slave-free sugar started appearing. The autobiography of freed slave Olauda Equiano became a best seller and many heard him speak.

Within five years of that first meeting at the James Phillip bookstore public opinion had turned against the slave trade. Parliament however would take longer to conquer. William Wilberforce was the spearhead of the parliamentary campaign.

So enormous, so dreadful, so irremediable did the trade’s wickedness appear that my own mind was completely made up for abolition. Let the consequences be what they would; I from this time determined that I would never rest until I had effected its abolition

Like Clarkson, Wilberforce met with fierce opposition and derision. Admiral Horatio Nelson for example, condemned “the damnable doctrine of Wilberforce and his hypocritical allies”. He also found the support of colleagues such as the Prime Minister, William Pitt.

Bills against the trade were moved in 1791, 1792, 1793, 1797, 1798, 1799, 1804, and 1805, all without success, until on February 27, 1807 a bill for the abolition of the slave trade passed the House by a vote of 283 to 16.

The anti slavery activists had assumed that once the shipping of slaves was outlawed slavery would collapse. This assumption proved naive. While no more slaves were shipped, slaves continued to be held on British owned plantations in the West Indies and their children enslaved. This set off continued campaigning. A mass uprising of slaves in 1831 signalled the oppression of slaves was no longer sustainable, and in 1833 the Emancipation Act finally saw the end of British slavery.

It took fifty six years, but who’d have thought that from that meeting of a dozen people in the James Phillip Bookstore on May 22, 1787, armed with nothing but their determination and their voices, would issue such a result?