Europe 1980-1982: Renault 5 most probable leader
Renault 5
I have no data for this period, however the fact that the Renault 5 lodged its record volume and shere in France in 1980 at 299,000 units and 16%, that it ranked #2 worldwide that year below just the Toyota Corolla, and that based on the information I could gather, the VW Golf only became #1 in Europe in 1983, the French small car appears as the most probable candidate for the title of European best-seller between 1980 and 1982. If you have official sales information for this period please make sure to get in touch!