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Hookworms, for example, used to devastate communities in the South, but they were by and large eradicated with the introduction of indoor plumbing and urbanization.

The owner must also reroute services such as electrics and plumbing and restore fixtures and fittings to their original listed status.

Buckingham Palace says the current figures are higher because of a 10-year, £369m project to modernise facilities in the Palace, including cabling, plumbing, wiring and lifts.

Workers then install insulation, cabinetry, electrical, plumbing and more, usually in about 12 to 15 days.

Lead is a heavy metal commonly found in car batteries, household electronics, ceramic pottery, plumbing fixtures and other applications.