Knowsley Safari Park had a very similar sealion exhibit last time I was there (albeit a couple of years ago). It's a disappointment to still see these type of pools in animal collections.
I know Knowsley pool well have even seen it with a Dolphin in it in 1986,have got a few shots of Blair Drummond anything you are particularly intrested?
Sorry not got photos of the chimps island,might have some of the Elephants but not on digitial so will have a look if they are any good will scan them and put them up that way,will be going up their next year so could take some pictures for you then.
