Slightly Longer Slavery in the British Empire

just out of curiosity, what does everyone think would be the effects on history if slavery was not abolished in the British Empire in 1838? lets say that, at the absolute latest, it extends to 1860 when, IOTL, the indenture system was abolished in British India (it being the year the ACW started is just coincidence)

now, while i specified 1860 as the latest, what i'm really looking for is the most plausible date after 1838
 
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