I was just about to post what goodlife said.
A wood construction, damaged during bad weather, would most certainly have been dangerous.
The person who telephoned the council for advice, which was followed (at the time) probably would now no longer have a plot nor would he even be living in the area maybe with no forwarding address. The person may well have passed away or retired abroad.
You should also have a clause in your constitution exempting individual committee members from personal responsibility. The Association who sells you your public indemnity insurance will advise on that.