I recall (not to say my memory on it is accurate) in the mid to late eighties there being a couple of vivs full of rattlesnakes and a Gila Monster in the far corridor. On the front an Anoconda, a couple of species of Green Mamba and Egyptian Cobra which I hardly ever saw. Think they got snouted Cobra in the 90’s.
It was the Best reptile collection other than London Zoo I’ve seen in the UK. I would argue the collection today is better than many realise because of the spread across the whole Zoo.
Green Anaconda were housed in the bigger vivs at the front, both western green mamba and eastern green mamba were also in the front vivs I think, but not held at the same time. I remember rattlesnakes, not sure if they were at the front, or the back corridor, I think probably both.
Can't remember Egyptian cobra but thry had Monocled cobra for a long timne, I even saw one hood one day, but my film had run out.
Snouted Cobra were kept in the front vivs for a few years in the 1990s, next door I think were the rhinoceros vipers