Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_67 (constructor VARCHAR, circuit VARCHAR, winning_driver VARCHAR)
### Question:
Who is the constructor of John Surtees's Oulton Park circuit car?
### Answer:
SELECT constructor FROM table_name_67 WHERE circuit = "oulton park" AND winning_driver = "john surtees"