“As a result of our investigations we are very concerned about the North Roof. Our conundrum is that we have reason to believe that one of the beams is failing resulting in the north roof being in danger of collapse. We would like to prop from the inside, drawing attached, but we can't as this would be putting people at risk whilst undertaking the propping. The other alternative is to take the load from an external structure but again we can't because this would mean putting people on the roof again putting people at risk. ”