Blackbrook sounds like a topnotch collection, but I guess that if its not in the EAZA (I wonder why not?) then 'rules are rules' even if they seem unrealistic or silly in this instance. I imagine you could keep three sibling male RRH's together indefinately- either castrated or not- and without females there would be no breeding problem anyway. But yes, I think its a political/bureauratic muddle they've got into here.