Britain's Hidden Slave Trade Historian John Gilmore and writer Angelina Osborne visit four places connected with the British slave trade to tell their stories and reflect on their legacy. 3/4. A memorial to a four-year-old girl at a Cambridgeshire church provides a clue to the life of the leading black abolitionist Olaudah Equiano. We explore his links with the girl and consider how their two lives and his great book, The Interesting Narrative, influenced attitudes in 18th century Britain and promoted the struggle against slavery.