I have only just found out, and the sad loss fills me with memories. I have just turned 80 myself, so it is sometime since I built a computer. I have been in mainframe computers since the very early days, when I worked on the the design of air traffic control computers in a lab, but then moved on to the really big stuff, a KDF9 scientific computer with a massive 64k of matrix memory. I started a micro computer repair shop, (Computer Care Centre), in Macclesfield in the 80's, but after 6 years went back to mainframes, as i was an engineer indulging myself, and was not making much money.
I was thrilled when Overclockers started, and I remember ringing before setting of to buy my first tested overclocked CPU, which was in a little black box on an anti static pad. I was very impressed when I arrived, because Mark had a large anti static pad on the little counter, and when I commented, we soon started chatting about computers. He had heard about my repair shop, (it was certainly the first in the North), and after that, I spent a fortune, (in those days), at his shop, and when he expanded into his super store. But then life moves on, and the thrill of modding and fiddling with motherboards ebbed away, the last one built in 2011 still running at 4.4ghz.
Anyway, I will not go on, but we have lost a land mark in what was the small computer world. My sincere condolances to his family, he will not be forgotten, and you must be very proud of him and what he achieved.