It seems pretty soon something has gotta give at ZSL - London Regent's Park location. I am personally still of the opinion that it is / would be imperative to expand the current footprint of the London site into the park (which would require Royal intervention).
I feel like when you consider the big ABC collection Vienna has with only 6 more acres than London, or what Bristol Zoo is able to accomplish with only a third of the space London has, it seems like the problem isn’t London Zoo not having enough space it’s a matter of how they’ve mismanaged what they have.