I vaguely remember this enclosure (bearing in mind I was only 7 years old at the time of it's closure), I remember the old male sealion the most, believe his name was Pat.
I remember seeing the old set up, but hardly ever looked in as in those days because of the dead end and having to double back on yourself to get out again
I seam to remember some old articles on it in RATEL, The association of British wild animals Keepers journal. Sadly the disc with all my old photos from the mid 1990's has gone walk about