Hideaway London

You descend into Mount Street and find yourself in a proper subterranean space that's warm, moody, and absolutely packed with people having a genuinely good time. There's an energy here that you don't get in a lot of Mayfair restaurants—it's not stuffy, the staff actually chat to you, and everyone seems to be enjoying themselves rather than performing for Instagram. The cocktails are thoughtfully made without being pretentious, and the food comes out confident and satisfying. It's the kind of place where you feel like you've stumbled onto something locals actually use, not just somewhere tourists and expense-account diners roll through.