Wasn't the name change of Keeling's collection due to the fact that his wife owned the land, and she wished to have some input into it? I remember reading how resistant he was to the name change, and to the inclusion of certain domestic species throughout the site.
@ ParrotsAndrew - I get the nostalgia for a different time, I really do...in some ways the zoo industry as a whole was more honest back then, the purpose of a zoo was for people to marvel at, and therefore connect with, weird and wonderful life forms they may never have encountered before, or be likely to see anywhere else. Todays 'conservation theatre', and new exhibits needing to earn their marketing value through being 'cute' or identifiable in some other way (ie family structure, courtship), rather than 'of the other', fierce, unknown, or impressive, could be seen as a slightly bewildering state of affairs. I worked in a collection for a while where efforts were made not to dramatise the exhibits or make them appear fantastic or scary, in order for young children to relate to them (as opposed to exhibiting large or dangerous animals above eye level or in pits), yet in some ways that collection pioneered the fetishization of 'relatable cuteness' that we now see so often in the number of lemur, meerkat, penguin, and otter exhibits that appear everywhere.
I think for this reason, I still hold places like Howletts and Port Lympne in high regard....because their ethos is still fairly clear (although economy has started to erode that for the majority of the public IMO).
I also get your romanticism of the Welsh Mountain Zoo. For someone who clearly appreciates zoo history, this is one of the few remaining under-developed sites still open to the public. Of course new exhibits have appeared, but it is very much a 'zoo', with many older structures still standing. However, I disagree that those structures still need to house their original occupants. Someone mentioned Glasgow....the way they appropriated the polar bear exhibit for ocelots was, in my mind, genius, and the lush planting really made something out of a space no longer suitable for mentally-sound ursids. Had they bulldozed the pit, and put up a wood and glass exhibit, I think it would have been a shame.
I love zoo history, I love when older buildings are brought back to life, I think you should be excited about the changes at Dudley, given your nostalgia for eras past. However, we are no longer an authentic colonial power, nor should we be, and so it will never again be possible to plunder and destroy resources in other countries of the empire quite like we used to. Modern zoos are a hangover of those times, indeed today there are still a few elderly primates and elephants, set against carefully themed exhibit backdrops, who arrived as products of our once-strong colonial power. I am relieved to live in a time when governments of range countries, in many cases, at least own their ex situ specimens on paper.