Following the AF Concorde story when it happened and post factum postings, there seemed to be a general agreement that the runway should have been cleared of any debris after each heavy took off, and especially before a Concorde took off. According to all those pages and posts, this was not done. I don't remember who said it, but the gist was that almost every heavy aircraft loses something on takeoff. Therefore the snuff patrol, but the main point is that before every Concorde takeoff the runway was to be clean. Somebody screwed up.