Dirty Martini says:

Dirty Martini, Hanover Square, is located in the heart of fashionable Mayfair, nestled between Oxford Street and Bond Street and surrounded by top end restaurants. Once inside your eyes are greeted with statement chandeliers, textured tiles, de luxe banquettes and a stunning bottle wall design, but it’s the distinctively quirky layout that sets it apart from all other bars. An Aladdin’s Cave of nooks and passage ways, each area offers a different drinking experience. Customers can languidly sip a martini in the Martini Lounge, perch on a stool in the Main Bar, hire out the Tunnel for private parties, get away from it all in the exclusive Vault or kick back and chill out in the Bed.