Here's the notice he posted to his website on Oct 12:
Sadly, the time has come when I must tell all of my clients the present situation.
Over the next few months I will be closing the business and selling all of my stock to Phil Smith. I have a terminal illness. However I intend to carry on working as long as I can. Please bear with me if the phone is not always answered and email replies are slow as I have good and bad days.
I still have a lot of interesting items to add to the stock list and will add them when I can. For now, everything continues as usual.
Our thoughts and prayers go out to Derek.