The Household Cavalry in front of Horse Guards Parade. Sometimes you'll see the Blue and Royals who make up the other half of the Queens Life Guard.
At Horse Guards Arch, Changing the Guard takes place daily at 11.00 am (10.00 am on Sundays) and lasts about half an hour; it is normally held on Horse Guards Parade by the arch of Horse Guards Building.
Uploaded by nat_mach on August 20, 2011
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During the Olympics you couldn't drive anywhere around Horse Guards and the Mall - on Horse Guards because they were playing beach volleyball. The indignity of it. You can see a painting done for the roof at this link.