Ninian Home’s close friend and fellow Grenadian plantation owner, Alexander Campbell, a Scot from Islay, stayed at Paxton House (in 1772, 1774, 1775, & 1788-90 periodically) to relax whilst in Britain on business. He may have brought Ottobah Cugoano, his enslaved servant, to Paxton with him in 1772. Cugoano became a prominent abolitionist after gaining his freedom in 1773.

Campbell spent much of his life in the Caribbean. He co-purchased the Belmont and Tivoli estates in Grenada in 1763 and co-purchased the island of Mustique the same year.

Campbell and Ninian met on board a ship to the Caribbean, possibly in the 1750s or 60s. In 1777, Campbell combined with Ninian Home to acquire the 316-acre St. John plantation and acquired a half share of the 464-acre Paraclete estate.

Ninian purchased enslaved African people on Campbell’s behalf and transported them to Campbell’s estates whilst Campbell was absent from Grenada. By 1790, Campbell had at least 12 plantations in the Caribbean with around 900-1000 enslaved people, including 559 on his Grenadian estates alone.

In 1790, Campbell represented West Indian interests at the House of Commons’ Select Committee’s hearing against the abolition of the slave trade and met with Prime Minister Pitt. Campbell was captured alongside Ninian and others in March 1795 and executed during the Fédon Uprising, on 8 April 1795.