I don't think that was much of a clue, nicanary, so I'm not bothered.
I was at Silverstone for Friday practice and unusually was in the right place with camera ready when Stewart appeared, well out of control, and thumped into the bank a few yards to my left.
He got out of the wreckage p.d.q. and as there was plenty of time till the end of practice they called Beltoise in and Stewart was given his MS80 to qualify so that he could use it in the race. Beltoise, meanwhile, had to set a time in the MS84 (4-W-D) car that he would have to race.
It turned out that Stewart's time in the MS80 set up for Beltoise was still good enough for the middle of the front row so I reckoned it'd be a good race so bought a ticket for the Stowe grandstand as I left and came back next day. It was indeed a good race, at least for all but the last ten laps.