Lascelles was in Barbados by the age of 22, in 1712, following his elder brother George, who first crossed the
Atlantic Ocean in 1706. The Lascelles family had Barbados interests as early as 1648, establishing a plantation, a warehouse, and shipping interests for the rapidly developing colony, first settled by the English in 1625. Henry Lascelles settled in Barbados with his brother Edward, where he was a merchant and planter; George Lascelles returned to England to run the business there. It was a family-managed enterprise, concentrating on sugar production and exports, transportation of goods to supply the colony, and
slavery. Slaves were imported from west
Africa, put to work on the plantations, and were objects of lucrative financial trading by the business leaders. The
triangular shipping trade routes of the era ran as follows: British goods were shipped to West Africa, slaves were bought in exchange for the goods and shipped to Barbados and other West Indian islands for sale, and sugar and other export crops were shipped to Britain, with great profits on all three journey legs. Barbados was by about 1680 the most prosperous English colony in the Americas.;
Customs Collector In 1714, Lascelles gained the powerful position of Collector of Customs for Barbados, coinciding with the ascension of the new
prime minister Sir Robert Walpole, a Whig. This influential and lucrative post, a reward for earlier political loyalties, was to remain in family hands for the next three decades. Lascelles was in charge of collecting duties on Barbados colonial exports (including his own), usually at the rate of 4.5 per cent; this money would then be remitted to the Treasury in London. ==Business expansion==