user: Question: Who was the winning driver of the British Grand Prix where Giuseppe Farina had the fastest lap?
Columns: ['Race', 'Circuit', 'Date', 'Pole position', 'Fastest lap', 'Winning driver', 'Constructor', 'Tyre', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Swiss Grand Prix', 'Bremgarten', '27 May', 'Juan Manuel Fangio', 'Juan Manuel Fangio', 'Juan Manuel Fangio', 'Alfa Romeo', 'P', 'Report']
SQL:

assistant: SELECT "Winning driver" FROM "Table" WHERE "Fastest lap" = 'Giuseppe Farina' AND "Race" = 'British Grand Prix';