This is not to start a new full results and discussions thread, but..
https://www.touringcars.net/database/race.php?id=418
http://touringcarracing.net/Races/19...stone%202.html
These are links to round 5 at Silverstone supporting the FIA F2 race. Tom Walkinshaw seems to have made a one-off start during this season. In either a #33 class B BMW 635CSi or a #33 class B Mazda RX-7, and non-starting an un-# BMW 530i with a flexing chassis. Either way he qualified second.
First, the 635 was a group 2 car by 1980, and only for 1983 was it produced in sufficient numbers to be homologated into group A, which had the same production minimums as group 1.
Running the Mazda programme it would make sense that he raced an RX-7, but I bet that he could still have pulled a 530i out of the workshop from the 1977-78 season, for what ever reason.
Can anyone help or elaborate on this question, then please.
Jesper