Joe,
I am so so sorry to hear this, really gutted. Please pass on my sincerest condolences to Fiona and Calum.
Growing up in north wales, John was one of the old heads around who was always welcoming and friendly with us youngsters, as were the other stalwarts, Chico, Mark Speakman, Phil Blacknell, Chris Fenny etc. In the mid to late 80s when me, Mossy, Pete Griffin etc were mods aged 16/17 we started buying records off John having met him in the Tudor House shop on Lower Bridge St in Chester where our mate Dave ran the record counter. He always had amazing under-the-radar stuff that we hoovered up off him and then played on the mod scene. A lot were unknown at the time. I'm talking '86ish. He had loads of gold fania (inc Use It Before You Lose It), R&B and other obscure nuggets. He loved his latin - Willie Rosario etc. We used to go round to his house and stay there for hours just playing tunes and buying bits. It was a treasure trove!
It was only a couple of months ago on here we were PMing trying to arrange a get together for us all now we all live all over the place. He was such a smashing fella and we'll really miss him. He'll be up there now playing some boogaloo that's for sure. RIP John.
Rich