“As a boy, he had worked as a carter for the 5th Duke of Portland, wheeling stone from the local quarry, used to construct a vast network of underground rooms that extended for twelve miles under the Welbeck estate. There was a ballroom that could accommodate 2,000 people and a riding school with a gallop a quarter of a mile long, lit by 8,000 jets of gas. One tunnel led to a suite of rooms covering four acres, and another to stables, cow-houses and dairies, where more than sixty people were employed.”