Stuff like that dodgy scaffolding suggests that most of these structures were not designed to last 26+ years anyway. I imagine when they built Chessington they were gambling on whether the public would receive a theme park well, and therefore did not want to spend huge amounts on hard wearing construction.
26 years is good enough, everything has served its purpose well but they must invest in better maintenance this time whilst rebuilding everything they removed.
Cutting the obelisk in half to test its strength is… unusual to say the least. Please replace it!