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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.

The IET concluded underground cables were, on average, around four-and-a-half times more expensive than overhead lines while cabling out at sea could be up to 11 times more expensive.

These are then used for a whole range of applications, from making PPE to cabling, building materials and dyes.

The spokesperson said they were working "to overcome additional challenges such as secondary damages and additional poling and cabling work in some areas".

Miles of trenches may be dug for cabling, large new electricity substations and converter stations have been proposed, and plans for offshore wind farms have already been approved.