There was a man, Hans Sloane from Co Down, a Royal physician, who travelled to Jamaica in 1687. He was there to, among others, catalogue botanic species.

The Natural History Museum lists Sloane as the inventor of drinking chocolate with milk. However, according to Jame Delbougo, a historian, the Jamaicans were brewing “a hot beverage brewed from shavings of freshly harvested cacao, boiled with milk and cinnamon” as far back as 1494.  Sloane may have devised his own recipe for mixing chocolate with milk, though if so, he was probably not the first. (Some sources credit Daniel Peter as the inventor in 1875, using condensed milk; other sources point out that milk was added to chocolate centuries earlier in some countries.) By the 1750s, a Soho grocer named Nicholas Sanders claimed to be selling Sloane’s recipe as a medicinal elixir, perhaps making “Sir Hans Sloane’s Milk Chocolate” the first brand-name milk chocolate drink. By the nineteenth century, the Cadbury Brothers sold tins of drinking chocolate whose trade cards also invoked Sloane’s recipe.

He was also a very controversial figure. Married to a rich lady, he could devote his life to botanics – his passion, but also he was a witness and observer of the treatment of the slaves working in the plantations… More about him and his life here:

https://www.nhm.ac.uk/discover/hans-sloane-physician-collector-botanist.html