In Dostoevsky's masterpiece "The Gambler", an idealistic but spiritually confused young Russian finds hilself in a 19th Century German resort, surrounded by morally corrupt Frenchmen, greedy beligerent Germans, and a grotesque carnival of posturing Russian phonies.
He also makes the aquaintance of the mysterious Mr Astley, a quiet and self effacing Englishman with a dignified bearing and upstanding character. During a convesation at the end of the story, the Englishman, who is ostensibly the one trustworthy character in the novella, lets slip that all his family's wealth comes from sugar. In other words, even the decent and admirable English got rich off the back of the slave trade.
If you want to see a living example of England's historic connection with the slave trade, & you like industrial architecture, have a gander at the magnificent Tate & Lyle building at Silvertown near City Aeroport - before it gets pulled down.