For decades, the posh clubs of London have remained closed off—cosseted, velvety sanctuaries of exclusion. “London is unique in its club culture and is very restrictive for international visitors in that regard,” explains Darius Namdar. That’s about to change, thanks to the opening of The Twenty Two, a new hotel and private members club opening in Mayfair this spring.Born and raised in London, Namdar began his hospitality career in the kitchen of the historic restaurant Wheeler’s on St. James, e...