Julie, Countess of Sandwich, has spent a decade running Mapperton House, a Jacobean manor in west Dorset, juggling roles as venue manager, fundraiser, conservator and content creator. She says the title is the least interesting part of the job and prefers to build things rather than wait to be discovered.

She launched an American Countess YouTube channel and a Patreon with tiers up to £77.50 a month, and is now raising £30,000-£40,000 to restore a historic bedroom. The ventures attract mainly American women over 45 and she dismisses critics who equate commercial effort with loss of dignity.

At Longleat, Emma, Marchioness of Bath, a former Victoria’s Secret model, runs a food brand, appears on TV, and oversees seasonal events such as Halloween and the Festival of Light. The estate draws 800,000 visitors a year, and her sons already help with tours and animal demonstrations.

Both chatelaines view themselves as links in a centuries‑long chain, turning ancestral homes into living archives that can survive another hundred years in family hands.