Donít know the answer to why the shop shut, like you I remember it was sudden.
Although I had a bit of a collection, AC was the guy who really got me into collecting Hibs programmes
I just wished I had invested more in the older issues which I remember looking at. He had brilliant stock, including pre war issues which would now be worth a small fortune.
As an inexperienced collector, I remember picking up 1980s issues and working my way back. The shop must have shut about 1987ish ???