A search for user names reveals only "Lightning Mate" and no "lightningmate" so I'm assuming there is no ambiguity. LM last posted in April 2014 (on the loss of the MSA flight thread).
A sad loss to the forum. He and I had an unsuccessful battle with the mods who were being rather petty about a quiz thread on Aviation Nostalgia which they closed for no better reason than they didn't understand the rather cryptic clues which made up the questions! LM took this to heart and got himself banned for his robust remarks about the mod who closed the thread down.
I have a nice souvenir of him in the form of a lovely photo of a 29 Sqn Lightning in company with a Victor K1 on their way to Cyprus, with the Alps in the background, which LM took from the other Lightning in the formation. I use the picture as my screen "wallpaper", so I'll be reminded of him, as well as many happy Panther Trails each time I switch my computer on.
RIP LM