Whitehall, London

[Localgirl]

What is the two-word name of the building in Whitehall, London, which was once the Headquarters of the British Army, a name now more familiarly applied to a certain regiment of the British Army?

[janeeastham]

I believe the answer is Horse Guards.

[Ward-Minter]

certainly is.

 If not simply "Main Building" as it was once called.

[Localgirl]

Thanks very much for that - been searching for it for ages!