conditions for improved methods to be tried more often, rather than anesthetizing animals.
Thing is, its not going to be great for London to have any more problems, and embarking on AI with a great ape species would be unusual enough to lead interested press and members of the public back to the central problem, which is that the have so far failed to create a successful breeding group of gorillas.
even if ZSL manages to have immense breeding success with a new male (assuming they obtain one), ZSL will remain in the shadow of the nearest large zoo, Chessington, in terms of gorillas, of which it shares all the largest 'ABC' species: Sumatran tigers, Asiatic lions, gorillas, and soon giraffe.
Orang-utans will just look awful unless they are in semi-natural vegetation, even a Chester-style exhibit in a built-up area such as London will be dreadful
I think in this publicity conscious era, they might value the publicity gained from trying to AI a female (presumably Mjuku) over the negative aspects of it, particularly if it didn't involve anaethsesia. (I remember how the London females Zaire & Diana were repeatedly 'knocked out' during the Hepatitis B 'scare' -a very bad and risky scenario.) However to my mind it is complete folly to go down this difficult route with such a low success rate, when there are obvious natural options available.
It is ironical ZSL have so many problems trying to breed Gorillas, while at Chessington half the females are still(afaik) on contraceptives to prevent too many babies- either because of space or EEP recommendation, I am not sure which.
Orangutans are one of the most expensive species to house well- unless you happen to have a well wooded location like Paignton's. Although Sumatran orangutans do make an active display and I think more holders would be welcome, I don't think London is really the place for them.
Bonobos on the other hand could be accomodated with only the same sort of changes to existing buildings(in the Sobell area) as was done for Gorilla Kingdom. (There is also unused space there currently given over to Aviaries and footpaths.)