You could easily miss the exclusive Les Ambassadeurs casino in London. Just off Hyde Park Corner, it sits at the end of a quiet side street populated only with chauffeured black vans waiting to whisk wealthy guests to five-star restaurants or soccer games. The casino’s sole imposition on the street is a red awning above the door. A wall of fragrance, floral and citrus notes to the fore, hits as you cross the marble tiles to be greeted by a receptionist.

Owned by Paul Suen Cho Hung, a China-born businessman who also counts Birmingham City Football Club as a U.K. trophy asset, “Les A” is among the most exclusive gambling dens in the British capital, charging £25,000 ($31,340) a year for membership.