Maybe 1996, but that's when I left Sheffield so that's the latest. Was it widely reported then? Quite a small job, in fact I reckon it was less than a weeks work I don't remember it being in the papers. Do I know you? Or do you know those responsible for the "rebuilding"?
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The latter
Although I do know more people who used the site who thought they were absolute twats...
[quite]Yes, we do know. If later cultures destroyed earlier ones they always left some mark, and very often a lot more. I've dug many sites in London with over two metres of stratigraphic remains, and it's always possible to identify the story of that place, and be very precise about in what order it happened. It's possible to destroy all evidence now, because very large structures go down several stories and remove everything of the past, but we've had rescue archaeology long enough for nothing major to have been missed since that became common place. In the office of The Museum Of London is a map of London with every excavated area coloured in black. You'd be amazed at how much black there is. They should publish on their website.