I have been asked to remove a glass canopy over the front of a small high street hotel in my village. The hotel is grade 2 listed.Some of the timbers are rotten and full of woodworm and some glass panes are cracked. The canopy is about 8m long and 2.5m wide (protruding from building) over the entrance, looks like a lean to supported on cast iron posts. There are bedroom windows overlooking above this canopy The glass is Georgian wired 8mm supported on 4x2 timbers, with lead cappings at the joints. Can I replace with the same as fitted or can I use polycarbonate twin/triple wall for safety? Do I need to consult BC ?