grantsmb asked me if there still live okapi's that are born in Bristol Zoo.
And yes, there is one.
Mbuti (M) born on 05-09-'04, he is seventh line from of the original line (mazanga+Bakeda).
So the Bristol line has been in existence at Bristol throughout- it won't need to be resurrected when the new female arrives.
Chester Zoofans can now admire the male 'Mbuti' with the added knowledge that he represents the 7th generation from Bristol's pair originally imported in the early 1960's.