What is the official designation of the building visible from the Morpeth Arms in a manner enabling spying?
Morpeth Arms The Morpeth Arms is a public house at 58 Millbank, in the Pimlico district of London. It was built in 1845 to refresh prison warders serving at the Millbank Penitentiary. It now contains a Spying Room which provides a good view of the headquarters of the Secret Intelligence Service across the river. The building is listed as Grade II and it is now part of the Young's estate.
Spy basket The Spy gondola, Spy basket, Observation car or sub-cloud car (German: "Spähgondel" or "Spähkorb" ) was a byproduct of "Peilgondel" development (a gondola to weight an airship's radio-locating antenna). They were used almost entirely by the Germans in the First World War on their military airships. The spy basket could be lowered from above through the cloud deck several hundred metres, in order to inconspicuously observe the ground and to help navigate the airship.