I see a house that size, the pool, the tennis court, the land, and I think WORK.
The maintenance required will be insane. Cleaning, heating, decorating, repairs, painting, gardening - roofs, plumbing, electrics, fences, gravel driveways, tarmac parking space, chimneys, lawn, ‘wild’ garden, manicured garden, warm weather outdoor furniture, all the indoors furniture and carpets and rugs and curtains.
And the cost. £5m to buy the thing, tens of thousands to heat it and pay taxes on it, hundred thousand for maintenance and upkeep and repairs. If I were housing a dozen people FT, who all availed of everything and I could divide the costs accordingly per head (and if I had the money 😂) I’d consider it. But if I were housing a dozen people this would be the least of my worries!!