Really sorry to hear this - spent some entertaining afternoons in his back room mid-late 90's. The first couple of times especially he had boxes full of Twinight, M-Pac, King, Federal, Mar-V-Lus, etc - a real treasure trove.
One time I wrote to him shortly after visiting asking for two records I had forgotten to buy. A few days later the records arrived in the post with a note saying 'these records are priceless, and therefore free' - that was the kind of guy he was. Another time I rang up for something on his list that he had already sold, so he let me have his own copy instead.
Definite end of an era - RIP John