Across the globe, spies gather in inconspicuous dens for hush-hush conversation and impromptu reunions. This week, Intelligence Online explores the inner circle of the British Army's oldest military intelligence regiment.
It's hard for the curious visitor to enter the expansive central London HQ of the Honourable Artillery Company (HAC) undetected: you can't get in without showing some ID. You also need to dress appropriately to gain access to a building which, in keeping with tradition, still houses a variety of arms and ammunition.
