Conservation experts? Pah! If English Heritage were experts they would have published far more detailed updates by now on the condition of the Atkinson/BBC tunnel and finds (both of the archaeological and the tatty-tyre kind) within it. Instead, what we are getting is a drip, drip, drip of minor details and the withholding from the public of information that would show English Heritage, its predecessor and its associates as the incompetent amateurs that they are.
As for English Heritage's Ask the Experts* link? Not a single question nor a single answer to be found there (but plenty of answers have been sent privately by English Heritage to individual members of the public). Now why is that? Are English Heritage afraid of a public debate?