I think the UK has a more diverse captive animal collection that say 15-20 years ago. I no longer think there is a need to worry about there being, say, three honey badgers left or 2 gaur, as there is the potential now for zoos to easily acquire individuals from other collections. I would not have been able to imagine, say, 15 years ago, the collections now at Sandwich, Edinburgh, or Colchester for example. The only groups where diversity is dwindling are passerines mainly where imports from the wild would previously obscure the fact that breeding success in captivity was very poor.