TBH: I think ZSL must focus on an concentrate on the neat and extraordinary animals in the animal kingdom. More diversity in terms of smaller species and orders (decent bird, reptile, amphibian, fish and invert collection) with several larger signature species (gorilla, tiger, giraffe, smaller primates (after the Celebes cresteds move to WH and colobus to the Snowdon.
Bulldoze the 2 concrete slab eyesores in the middle of the zoo. Architectural heritage, but animal welfare disasters now, For goodness sake it is a zoo.
I would favour bachelor male giraffe herd going forward, fix up the gorilla family and with silverback, a spruced up Madagascar area with mammals, birds, reptiles, a West African primate focus near gorilla (mangabey, Diana monkey), next to gibbons another langur species silvered leaf f.i.