Have found a contemporary article by Dieter Stappert, who had hitched a ride to the test with Lauda in his hire car.
Stappert reports that Lauda had never been to Le Castellet before, so after a few laps in the Simca hire car, Regazzoni took him round in his Ferrari to show him the right lines – though the Swiss complained there was a lot of sand on the track, making things tricky.
The team had brought along three cars: a P160, as he had been seen in the last Grand Prix; a normal P180, and another P160 which had some invisible modifications and a new nose fairing. Regazzoni drove the normal 160, Schuppan the modified P160 and Lauda was allowed in the P180 to get used to the BRM “driving experience”. The short le Castellet circuit was used as comparison times were available from the Goodyear tyre tests a week earlier (Hulme’s best then, in better conditions, being 1’12”4.
It was soon clear that the times set by Regazzoni at Silverstone were not a flash in the pan. After a few short sessions, the Ticinese worked down to 1'13 "8, 1'13" 2, 1'12 "9 and 1'12" 6, although the car was set up for the long circuit. Schuppan could not do better than 1'17 "4 with the modified P160, although the new front fairing made the handling rather unpleasant. Finally, Lauda was given three short sessions with the P180, clocking a 1'15 "8 which impressed Parnell, who commented that "the P180 is definitely two and a half seconds slower than the P160”.
Edited by Jon Saltinstall, 18 August 2018 - 11:25.