Good thread idea, Graham
The "infamous" year 1979 with those two separate championships was a consequence of heavy lobbying by traditionalists ( led by Schwarzel, Steinhausen , Schauzu...and hence named "the germans" in the french press of the times ) to come back to the roots of "real sidecars" . Without going into unnecessarily complex technical details, the B2A category was for outfits with a traditional "earles" type front suspension and steering by direct handlebars , whereas the B2B was for modern outfits with car-type triangular suspensions .
But this desperate attempt by "the germans" failed miserably, since their best enemy, Swiss Rolf Biland, who was the figurehead of the "moderns" , failed to win the B2B category ( beaten by the consistency of Bruno Holzer who came second in each single race, whereas Biland and Alain Michel shared the wins but had a few DNF's...) but made a point to also enter the B2A championship with a traditional outfit , and to trash "the germans" with his pure riding skills...
All the results one can wish to find about sidecars are still on the late Vincent Glon's website, which is still online to this day http://racingmemo.fr.....0- GRILLE.htm
(clicking on the champion's name in the large general file leads to the details of each season )