I have actually spent an evening in the main hall at Harrow School once as where I was teaching used it for their speech day. We were all lined up in a row on the stage wearing our graduation uniforms, and mine knocked some of the awards off the table as it dragged past. Very memorable...
This shows it's not all buildings in London, these two are in a field where the buildings end in North Finchley on the Mill Hill border.

This looks too big again, no idea what Photobucket's doing at the moment.