The Californian Sealions left during the cutbacks when the zoo almost closed (around 1990, the first time). Later, a solitary fur seal (I'm sure it was south American) occupied the same pool for a year or two. In the mid-nineties, the crane paddock (formerly some of the stork and ostrich house runs) was connected over the path to the pool to create a low-budget but apparently new exhibit for pygmy hippos.
I don't think that the current tapir exhibit is entirely suitable, the outdoor area is very small for a start, but ZSL have bred Malayan tapir twice now in the current exhibit, it is quiet and fairly secluded, and the heated indoor space of the cotton terraces is far superior and larger than anything they would have in either the casson or the old stork and ostrich house. It would just be nice to see a chute built over some of the path to allow them to access the south bank wooded area during the summer, in the same way that port lympne have their paddocks across the visitor path from the house and yard.
I am sure that ZSL are not risking announcing the tapir calf until it is almost six months' old, if at all, after the premature announcement of the imminent okapi calf last year. With this in mind, they should be commended for shutting the tapir house throughout the entire winter.