When completed, the home at 39 Charles Street will boast seven palatial bedroom suites, eight state rooms, a leisure complex and a private cinema.

The main bedroom suite will be spread across 2,000 sq ft, twice the size of the average new UK home, and will include his and hers dressing rooms and bathrooms.

There will be an eight-person lift, a mews home for guests or staff, a wine room, an office, a catering kitchen and high-security vaults.

The job won’t be easy though. Even the period Chinese wallpaper is listed and will need to be restored.