It is a good document but not 100% reliable. For example, look up the Chessington Gorillas and it shows 'Lomie' (mother of Shani) as dying at Howletts- not correct, she died at Chessington..
Although it shows most of the Gorillas at Chessington (except Damisi) as being ' Owned by Chessington' I think it is more complex than that, because founder members of the group came from various sources;
Kumba & Baffia(old pair) - definately owned by Chessington.
Lomie- came from Howletts and previously London, who I think BOUGHT her from Chessington originally(for £4000) so I believe she was actually London's animal.
Kaja- came from Howletts as part of a complicated deal involving animal exchanges of various species between Lincoln Park, Howletts and London so I am not sure whether her ownership changed as a result.
2nd(Jersey) Kumba(who came from London)-was probably still owned by Jersey where he was born.
As the rest of the group are descended from the above animals, exactly 'who owns who' (including Mjuku and her baby) could be debatable, though as both ZSL and Chessington are EEP participants it is perhaps only theoretical nowadays.
I think at London they will not be trying to get Kesho and Mjuku together now, given her impending(?) birth. They will have to wait till later.