user: Question: Who is the constructor of John Surtees's Oulton Park circuit car?
Columns: ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['XIV Argentine Grand Prix', 'Buenos Aires', '24 January', 'Chris Amon', 'Matra', 'Report']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Circuit" = 'Oulton Park' AND "Winning driver" = 'John Surtees';