Klem- i've just gone through that forum thread you posted the link to
http://www.ww2aircraft.net/forum/avi...2-a-20108.html
I'd say that nails it- credit must go to MikeWilliams and Glider for their research efforts- the weight of evidence clearly affirms the fact that 100 octane fuel was widely used by RAF fighter command since early summer 1940.
As for the tone on that forum- it's a marked contrast to the personal insults that get thrown around here.