Slaw,
Per my post above, Bob Brunning played bass on FM's first few gigs because John McVie was reluctant to leave his steady gig with John Mayall's Bluesbreakers, notwithstanding the fact that Green and Fleetwood were bolting from Mayall to start their new band. I believe that one of those early shows made it to a live album, so J McVie isn't really a founding member. OTOH, he did join within a few months and has been there without fail for the 45+ years that followed, so - yeah - he's definitely a long timer.
Per my post above, Bob Brunning played bass on FM's first few gigs because John McVie was reluctant to leave his steady gig with John Mayall's Bluesbreakers, notwithstanding the fact that Green and Fleetwood were bolting from Mayall to start their new band. I believe that one of those early shows made it to a live album, so J McVie isn't really a founding member. OTOH, he did join within a few months and has been there without fail for the 45+ years that followed, so - yeah - he's definitely a long timer.