When I visited Whipsnade in May, I spoke to one of the hippo keepers. He claimed that there are plans to bring in a new female Pygmy Hippo to breed with Tapon, but that there are no plans to bring in a bull male to breed with Hodor or Lola, the Common mother and daughter. Perhaps their bloodline is overrepresented, but as far as I am concerned, this seems like a fairly strange decision, given that the arrival of Amara at London earlier this year (from Edinburgh) means that there will soon be a chance of breeding Pygmy Hippos at a ZSL collection regardless of what Whipsnade does.
For the Commons, there isn't such a thing, and given how growingly rare this species is in British zoos (with one of Longleat's females sadly passing away earlier this year), and how popular they always seem to be among visitors, surely continuing the breeding of Common Hippos at ZSL should be a priority? I understand that the zoo is quite happy with their current setup, using the former bull enclosure as a secondary enclosure for the two females, with them regularly rotating between the two so as to guarantee that there is always ample grass for them to graze on. This is an excellent feature, given that hippos are grazers and are rarely given the opportunity to demonstrate this in zoos, but I would still prioritise the arrival of a bull, and it isn't as though Whipsnade is lacking in space nearby to expand their hippo enclosure if they really want to keep the setup as it is.
I am sure that the zoo has a good reason, and of course, as it has been four months, and still no female Pygmy has arrived, it is possible that plans have changed or that the keeper I spoke to was misinformed. But it would be a real shame if Whipsnade were to go out of keeping Common Hippos...