Aerial photo of The SIS Building, also commonly known as the MI6 Building, is the headquarters of the British Secret Intelligence Service

Aerial photo of The SIS Building, also commonly known as the MI6 Building, is the headquarters of the British Secret Intelligence Service

Aerial photo of The SIS Building, also commonly known as the MI6 Building, is the headquarters of the British Secret Intelligence Service

Aerial photo of The SIS Building, also commonly known as the MI6 Building, is the headquarters of the British Secret Intelligence Service