Susie Wolff is just the fourth woman in a decade to drive a Formula One car. She dedicated her first experience to Maria de Villota, who lost the sight in her right eye in a crash in July.
Wolff, a development driver for Williams, completed 62 miles of Silverstone's international circuit on Wednesday.
De Villota tested for Lotus-Renault last year at the Paul Ricard circuit near Marseille. In March she joined Marussia as a test driver, but lost the sight in her right eye in an accident at Duxford Airfield.
Wolff says "We were in contact a couple of weeks ago and she told me to drive for the both of us now, that I would be out there representing us both."