user: Question: What car did Tony Trimmer drive at the Oulton Park Circuit?
Columns: ['Round', 'Name', 'Circuit', 'Date', 'Winning driver', 'Winning car']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'International Gold Cup', 'Oulton Park', 'March 24', 'Tony Trimmer', 'McLaren M23']
SQL:

assistant: SELECT "Winning car" FROM "Table" WHERE "Circuit" = 'Oulton Park' AND "Winning driver" = 'Tony Trimmer';