AHC/WI:Britain only outlaws slave trade and slavery in early twentieth century?

I'm influenced by raharris1973's thread,but I don't want to derail it.POD could be anytime after 1700.Essentially,what would be the impact of this on world development?I'd presume that slavery would be banned much slower worldwide given Britain played a major role in influencing countries to abandon the practise.
 
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