What is this concrete building used for now? It had numerous cctv cameras on it... but so does the rest of the UK.
I tried to find out quite recently mate, but it's still a 'secret' building. As likely to be a bit of handy storage space as any other more interesting use though. Cheers, Adam.
IIRC it is used by the folks at Horse Guards which itself is a rabbit warren of tunnels, corridors and offices, as I recall it is a secret communications area. I asked once but the reply was 'if I told you I'd have to kill you'