The Regency mansion, which is Grade I listed, would be handy for a friend of the Queen, as it’s an easy stroll from Buckingham Palace.

It would also be a top spot for sight-seeing, should the buyer be so inclined, as it’s flanked by Trafalgar Square, The Mall, Pall Mall and St James Park.

With 50,000 sq ft of living area, it’s one of the city’s largest private homes.

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The Daily Mail says a “strictly confidential” brochure flogging the sale has been seen by uber-rich potential owners.

The exact owner isn’t public, but it’s registered in the British Virgin Islands and believed to belong to a Saudi Arabian royal family member.

At the asking price the buyer would be slapped with a £17.5m stamp duty bill.

The average house sold in the UK last month was £162,606.

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