Apologies I mis-read the poor energy efficiency comments about the tortoise building as referring to the Reptile House, my mistake.It's entirely different. Current costs are for individual vivaria, not public space which is largely unlit and unheated. The central arrangement for safe access to venomous species was world class when it was made and is still, in my view significantly better than what most collections have. I think this is really about the concept of a 'reptile house' along with cost saving. I'm sure the replacement will be good but what a loss...