Just in case you're not alone:

The first major government in world history to outright ban slavery was the British Empire who bought all their slaves' freedoms. The Royal Navy spent most of its resources in 1800s hunting down slave ships, freeing their "cargo" and executing the slave traders. The debts incurred to pay for all this were so huge they were still being paid off into the 1990s. The biggest promoter and profiter of the slave trade at the time was the royalty of Lagos who were the ones responsible for kidnapping their people and selling them as property. The UK successfully convinced other European powers to join it in ending the millennia-old slave industry.

There a lot of my country's history I'm not proud of - including taking advantage of slavery - but I'll be fucking damned if anyone is going to tell me that my country's biggest role in the slave trade was anything other than ending it.