I suspect you mean the "Aviation Institute", it pretty much died with the demise of Adrian, the bar tender/manager back in about 1995 (from memory). Was a fun night there on friday nights. The Loyds/Bristows, whoever it was supplied a band, a large percentage of the aviation community would spend friday nioghts there with regular closing around 3am. Lucky there was no DAMP back then I suspect.
Post 1995 you could buy lunch there and it was open at night, however very few continued to go there.