The entrance lobby to this clandestine venue was once a guard room and you'll find sumptuous interiors and moody lighting create the perfect atmosphere to enjoy some of the capital's best tipples in a place that forbids photography, another pointer to its undercover theme.
Its drinks menu pays homage to the classic Martini with nods to those who have previously walked the building's halls.
These libations include La Dame Blanche, named after a First World War intelligence network as well as Kiss of Death, which is a nod to the lethal lipstick-shaped pistol used by the KGB during the Cold War alongside the bar's Signature Vesper Martini.
Other cocktails have included The Spy Who Loved, Whisky Mouthwash and The Stinger.
Guests can quaff some of these stunning tipples through a tasting experience, enjoying three cocktails while the bar's knowledgeable team of mixologists guide guests through each drink with perfectly matched canapés served to enhance the tasting.
